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This One-Skillet Lemon Chicken with Summer Squash combines tender chicken breast, zucchini, yellow squash, and red onion with fresh lemon, garlic, and oregano. Everything cooks in the same skillet, creating a colorful dinner with bright Mediterranean-inspired flavors and minimal cleanup.

The chicken and summer squash are coated separately in a simple lemon marinade. Keeping those portions separate is important because it prevents the vegetables from coming into contact with marinade that has touched raw chicken. The chicken cooks first with softened red onion, followed by the zucchini and yellow squash over slightly higher heat so they can become lightly browned while staying crisp-tender.

A final splash of fresh lemon juice and a sprinkle of parsley brighten the entire skillet just before serving.

30-Minute Chicken and Zucchini Skillet with Lemon and Garlic

Why You’ll Love This Lemon Chicken with Summer Squash

It uses one skillet. The onion, chicken, zucchini, and yellow squash all cook in the same pan.
It’s ready quickly. Once everything is chopped and seasoned, the cooking process takes about 15 minutes.
Fresh lemon adds plenty of flavor. Lemon is used in both the marinade and the finishing step.
The vegetables stay fresh and colorful. Cooking the squash separately helps prevent it from becoming overly soft.
The marinade is simple. Olive oil, lemon, oregano, garlic, salt, and pepper provide all the seasoning you need.
It’s an easy weeknight main course. The chicken and vegetables are substantial enough to form the base of a complete dinner.

Ingredients

For the Lemon Marinade

3 tablespoons extra virgin olive oil
2 tablespoons fresh lemon juice
1 teaspoon dried oregano
2 to 3 garlic cloves, minced
Sea salt, to taste
Black pepper, to taste

The marinade is divided before the raw chicken is added. One portion seasons the chicken, while the untouched portion is used for the zucchini and yellow squash.

For the Chicken and Vegetables

1 pound boneless, skinless chicken breasts, cut into bite-sized cubes
½ large red onion, thinly sliced
1 small zucchini, thinly sliced and cut into half rounds
1 small yellow squash, thinly sliced and cut into half rounds
1 tablespoon extra virgin olive oil

Cut the chicken into reasonably similar-sized pieces so it cooks evenly.

Keep the zucchini and yellow squash slices similar in thickness as well. This makes it easier to get both vegetables crisp-tender at approximately the same time.

For Finishing and Garnish

1 tablespoon fresh lemon juice
Fresh parsley, chopped
Fresh basil leaves or small sprigs
Small lemon wedges

The final tablespoon of lemon juice is added after cooking so its flavor stays bright and fresh.

Equipment

2 mixing bowls
Large nonstick skillet
Whisk
Cutting board
Sharp knife
Clean serving platter
Instant-read thermometer

Easy One-Pan Lemon Chicken with Zucchini and Yellow Squash

How to Make One-Skillet Lemon Chicken with Summer Squash

Step 1: Make the Lemon Marinade

In a large mixing bowl, whisk together 3 tablespoons olive oil, 2 tablespoons fresh lemon juice, dried oregano, and minced garlic.

Season with sea salt and black pepper to taste.

Whisk until thoroughly combined.

Step 2: Divide the Marinade

Before adding the raw chicken, transfer half of the marinade to a separate bowl.

This creates two clean portions, one for the chicken and one for the vegetables.

Add the cubed chicken to one bowl and toss until all of the pieces are evenly coated.

Set aside while preparing the vegetables.

Step 3: Season the Summer Squash

Add the sliced zucchini and yellow squash to the bowl containing the unused portion of marinade.

Toss until the vegetables are lightly and evenly coated.

Set aside.

Do not use marinade that has been in contact with raw chicken to season the vegetables.

Step 4: Cook the Red Onion

Heat a large nonstick skillet over medium heat.

Add the remaining 1 tablespoon olive oil, followed by the thinly sliced red onion.

Season lightly with sea salt and black pepper.

Cook for 4 to 5 minutes, stirring occasionally, until the onion has softened and begins to develop some color.

Step 5: Cook the Chicken

Add the marinated chicken to the skillet with the softened onion.

Cook for approximately 8 to 10 minutes, stirring occasionally, until the chicken is golden in places and completely cooked through.

Check a larger piece with an instant-read thermometer. The chicken should reach an internal temperature of 165°F (74°C).

Transfer the cooked chicken and onions, including the flavorful juices from the skillet, to a clean serving platter.

Set aside briefly.

Step 6: Cook the Zucchini and Yellow Squash

Increase the heat to medium-high.

Add the seasoned zucchini and yellow squash to the same skillet.

Season with additional salt and black pepper only if needed.

Cook for 3 to 5 minutes, stirring occasionally, until the vegetables are lightly browned and crisp-tender.

Avoid cooking them until completely soft. Zucchini and yellow squash contain plenty of moisture and can quickly become watery when overcooked.

Step 7: Return the Chicken to the Skillet

Return the cooked chicken, red onion, and any accumulated juices from the platter to the skillet.

Gently stir everything together.

Cook only briefly, until the chicken is heated through and the vegetables and chicken are evenly combined.

Step 8: Finish with Fresh Lemon

Remove the skillet from the heat.

Drizzle the remaining 1 tablespoon fresh lemon juice over the chicken and vegetables.

Sprinkle with chopped fresh parsley and garnish with fresh basil leaves or small sprigs.

Serve immediately with small lemon wedges on the side.

Tips for the Best Lemon Chicken and Summer Squash

Divide the marinade first. Do this before raw chicken enters either bowl.
Cut the chicken evenly. Similar-sized cubes are more likely to finish cooking at the same time.
Slice the squash consistently. Even slices help the zucchini and yellow squash cook at a similar rate.
Don’t overcrowd the squash unnecessarily. Giving the vegetables contact with the hot skillet helps them develop some color.
Increase the heat for the vegetables. Medium-high heat helps brown the squash quickly without requiring a long cooking time.
Keep the squash crisp-tender. Don’t wait for it to become completely soft.
Check the chicken temperature. The thickest pieces should reach 165°F (74°C).
Add the final lemon juice off the heat. This preserves more of its fresh citrus character.
Taste before adding more salt. Seasoning occurs at several stages, so additional salt may not be necessary.

Easy Lemon Garlic Chicken and Summer Squash Skillet

Common Mistakes to Avoid

Using the Chicken Marinade on the Vegetables

Once marinade has touched raw chicken, don’t use it as the uncooked seasoning for the zucchini and yellow squash.

Divide the marinade into separate bowls first.

Cutting the Chicken into Uneven Pieces

Very small cubes can become dry before larger pieces are safely cooked. Keep the pieces reasonably consistent.

Cooking the Squash Too Long

Zucchini and yellow squash soften quickly. Cooking them only until crisp-tender helps preserve their texture and prevents excess moisture from accumulating in the skillet.

Cooking Everything at Once

Adding the chicken, onion, zucchini, and yellow squash together may make it harder to control their individual textures.

Cooking the chicken and squash in stages allows the chicken to cook completely while keeping the vegetables from becoming overly soft.

Leaving the Chicken in the Pan While Cooking the Squash

Removing the cooked chicken before increasing the heat for the vegetables protects it from unnecessary additional cooking.

Skipping the Final Lemon Juice

The lemon juice added to the marinade provides flavor during cooking, but the final tablespoon serves a different purpose. Adding it after the skillet comes off the heat creates a fresher citrus finish.

Expert Tips

The two-stage cooking method is particularly useful with summer squash. Chicken needs enough time to reach a safe internal temperature, while thinly sliced zucchini and yellow squash need only a few minutes. Cooking them separately gives you much better control over both.

After removing the chicken, increase the skillet to medium-high before adding the squash. The hotter surface encourages light browning during the short cooking period.

When the chicken goes back into the skillet, it only needs enough time to become hot again. Avoid turning this into another extended cooking step.

For the brightest flavor, use freshly squeezed lemon juice rather than relying on bottled lemon juice. The finishing tablespoon is especially noticeable because it isn’t cooked for an extended period.

Variations

Extra-Lemony Chicken

Serve additional lemon wedges at the table so each person can add more citrus according to taste rather than increasing the lemon juice throughout the entire skillet.

More Garlic

Use 3 garlic cloves rather than 2 if you prefer a stronger garlic flavor.

Herb-Focused Version

Add a little extra fresh parsley when serving, or scatter fresh basil leaves over individual portions.

Vegetable-Forward Version

You can serve smaller portions of chicken with more zucchini and yellow squash if you want the vegetables to play a larger role in the meal. Additional vegetables may need to be cooked in batches to avoid overcrowding the skillet.

Ingredient Substitutions

Zucchini and Yellow Squash

If you only have one type of summer squash, you can use more of that variety while keeping the overall vegetable quantity similar.

Red Onion

The red onion contributes both color and a mild sweetness after cooking. Another onion variety can change the flavor slightly, so red onion is preferred when available.

Dried Oregano

The measured dried oregano provides concentrated herb flavor that works well in the lemon marinade. If using another herb, expect the flavor profile of the dish to change.

What to Serve With Lemon Chicken and Summer Squash

This skillet already contains chicken and vegetables, so a simple grain, salad, or light side can turn it into a more substantial meal.

Mediterranean Pasta Salad is a good choice for a larger summer dinner, particularly when you’re serving several people.

For something fresh and citrusy, Orange and Tahini Piyaz provides a flavorful contrast to the warm chicken and squash.

You could also serve the skillet with rice, couscous, or crusty bread to soak up the lemony juices.

Storage and Reheating

Allow leftovers to cool before transferring them to an airtight container.

Refrigerate promptly and use within 3 to 4 days.

Reheat the chicken and vegetables until thoroughly hot. Gentle reheating is preferable because excessive cooking can dry out the chicken and make the summer squash increasingly soft.

The squash will naturally lose some of its original crisp-tender texture during refrigeration and reheating.

If desired, add a fresh squeeze of lemon after reheating to restore some of the dish’s bright citrus flavor.

Make-Ahead Tips

You can save time by cutting the onion, zucchini, and yellow squash in advance and storing them covered in the refrigerator.

The chicken can also be cubed ahead of time and refrigerated separately.

For food safety and the freshest texture, keep the raw chicken separate from the vegetables and other ingredients.

The marinade comes together quickly, so it can be whisked together shortly before cooking. Remember to divide it before adding the chicken.

More Recipes to Try

If you enjoy fresh, flavorful skillet meals and Mediterranean-inspired recipes, try these next.

Grilled Spiced Shrimp Kabobs with Zhoug Sauce combine quickly cooked seafood and colorful vegetables with a fresh herb sauce.
Mediterranean Pasta Salad is a useful option when you want a fresh side dish or lighter meal.
Souvlaki Skewers and Tzatziki offer another Mediterranean-inspired dinner with plenty of fresh flavor.

One-Skillet Lemon Chicken with Zucchini and Summer Squash

Final Thoughts

One-Skillet Lemon Chicken with Summer Squash keeps dinner simple without sacrificing texture or flavor. Lemon, garlic, and oregano season the chicken and vegetables, while red onion adds sweetness and color.

The key is cooking the ingredients in stages. Let the chicken cook completely before transferring it from the skillet, then use medium-high heat to quickly cook the zucchini and yellow squash until they’re lightly browned but still crisp-tender.

Return everything to the skillet only long enough to heat through, then finish with fresh lemon juice, parsley, and basil. The result is a bright, colorful chicken dinner that’s especially well suited to zucchini and yellow squash season.