Chicken and Vegetable Frittata

Last Sunday morning, I stood in my kitchen staring at leftover roast chicken from dinner the night before. The fridge held random vegetables that needed using, and honestly, I just wanted something warm and comforting without another trip to the grocery store. That impulse decision turned into what's now my go-to meal for busy weekdays.

My sister was visiting when I first made this, and she literally stopped mid conversation after her first bite. Now she texts me every time she makes it, usually with some variation about what vegetables she used that time. It's become our thing—this simple, adaptable dish that somehow always works.

Ingredients

• 1 cup cooked chicken breast, diced: Leftover rotisserie chicken works beautifully here, or use whatever you have from a previous meal
• 6 large eggs: Room temperature eggs will incorporate more evenly into the mixture
• 1/4 cup milk: Whole milk creates the creamiest texture, but any milk you have works fine
• 1 cup baby spinach, roughly chopped: The spinach wilts down significantly, so don't be afraid to pile it in
• 1/2 cup bell pepper, diced: Red or yellow adds sweetness, while green brings a slight bitter contrast
• 1/2 cup zucchini, diced: Pat it dry after cutting to prevent excess moisture in your frittata
• 1/2 small red onion, finely chopped: Red onion mellows beautifully when cooked, adding just a hint of sweetness
• 1 clove garlic, minced: Add this in the last minute of sautéing so it doesn't burn
• 1/2 cup shredded cheddar or mozzarella cheese: Freshly grated melts better than pre-shredded
• 2 tbsp grated Parmesan cheese: This adds a salty, umami richness on top
• 1/2 tsp salt: Adjust based on how seasoned your cooked chicken already is
• 1/4 tsp black pepper: Freshly ground makes a noticeable difference
• 1/4 tsp dried oregano: Rub the dried herbs between your fingers before adding to release their oils
• 1/4 tsp dried thyme: This pairs beautifully with eggs and chicken
• 2 tbsp olive oil: Use this for sautéing the vegetables before adding the eggs

Instructions

Preheat and prep:

Get your oven to 375°F and make sure your skillet can handle the heat—check if it has an oven-safe handle

Sauté the aromatics:

Heat olive oil in your ovenproof skillet over medium heat, then cook the red onion and bell pepper for 2 minutes until they start to soften

Add the remaining vegetables:

Toss in the zucchini for another 2 minutes, then stir in garlic and spinach until the spinach just wilts—about 1 minute

Warm the chicken:

Add the diced chicken and cook just long enough to take the chill off, about 1 minute

Whisk the eggs:

In a separate bowl, beat the eggs with milk, salt, pepper, oregano, and thyme until completely combined

Combine and cook on stove:

Pour the egg mixture evenly over everything in the skillet, cook for 3-4 minutes until you see the edges starting to set

Add cheese and bake:

Sprinkle both cheeses on top, then transfer the whole skillet to the oven and bake for 12-15 minutes until the center is set and golden

Rest and serve:

Let it cool for 5 minutes—this helps the frittata set and makes slicing cleaner

Save

This frittata has saved me on countless nights when cooking felt impossible. There's something about putting leftovers on a plate and calling them dinner that just works.

Make It Your Own

The beauty of a frittata is its forgiveness. I've made this with leftover turkey, ham, even bacon when that's what I had on hand. The vegetables can change with the seasons—mushrooms and asparagus in spring, cherry tomatoes and fresh basil in summer.

Serving Suggestions

Sometimes I serve this straight from the skillet for breakfast with a side of fruit. Other times it becomes dinner with a crisp green salad dressed simply with vinaigrette. My kids don't know they're eating leftover chicken—they just know they love it.

Storage and Reheating

Leftovers keep beautifully in the refrigerator for up to four days. I actually think the flavors develop overnight, making it perfect for meal prep. When reheating, a quick 30-second burst in the microwave brings it back to life without drying it out.

• Wrap individual slices in plastic wrap for easy grab-and-go breakfasts
• A warm frittata makes an excellent addition to any brunch spread
• Room temperature pieces work surprisingly well for packed lunches

Save

There's something deeply satisfying about turning odds and ends into a meal worth sharing. That's the magic of a frittata—it meets you exactly where you are.

Recipe FAQs

→ Can I make this frittata ahead of time?

Yes, this frittata reheats wonderfully. Store in the refrigerator for up to 3 days and warm individual slices in the microwave or oven at 350°F for 10 minutes.

→ What vegetables work best in this dish?

Bell peppers, zucchini, spinach, and onions provide excellent texture and flavor. You can also add mushrooms, cherry tomatoes, or asparagus depending on seasonal availability.

→ Can I use uncooked chicken?

The instructions call for cooked chicken. If using raw chicken, cook it thoroughly in the skillet before adding vegetables, or poach and dice it beforehand.

→ Is this dish gluten-free?

Yes, naturally gluten-free. Just verify that your cheese brands and any additional seasonings are certified gluten-free if you have celiac concerns.

→ What type of skillet works best?

A 10-inch ovenproof skillet is ideal. Cast iron or stainless steel with an oven-safe handle works perfectly—non-stick makes easier serving but isn't essential.

→ Can I make it vegetarian?

Absolutely—simply omit the chicken or replace it with extra vegetables, chickpeas, or crumbled tofu for a protein-packed vegetarian version.