Chicken and vegetable frittata

The first time I made this frittata, I was staring at leftover roast chicken from Sunday dinner and a mountain of CSA vegetables that needed using. My kitchen smelled like garlic and thyme within minutes, and something about the way the cheese bubbled up golden brown made me feel like I'd stumbled onto a secret breakfast weapon. Now it's my go-to when I want something that looks impressive but actually takes zero brain power to assemble.

Last winter, my sister came over after a rough week at work, and I threw this together while she curled up on my couch with a glass of wine. Watching her face light up when she took that first bite, all warm and cheesy and fragrant, reminded me why I love cooking so much. Food really does fix things sometimes.

Ingredients

• Cooked chicken breast: Leftover rotisserie chicken works perfectly here, or save some from a roast dinner earlier in the week
• Large eggs: Room temperature eggs whisk up fluffier and incorporate better with the milk
• Baby spinach: It wilts down beautifully and adds fresh green color without overwhelming the dish
• Bell pepper: Red or yellow brings sweetness that balances the savory elements
• Zucchini: Dice it small so it cooks through quickly and adds moisture without making the frittata soggy
• Red onion: Finely chopped, it becomes sweet and mellow when sautéed
• Garlic: One clove goes a long way—mince it finely so it disperses evenly
• Shredded cheese: Cheddar gives sharpness, mozzarella adds incredible melt factor
• Grated Parmesan: This salty umami bomb on top creates the most delicious golden crust
• Dried oregano and thyme: Classic Italian herbs that complement both the chicken and vegetables
• Olive oil: Use enough to coat the pan generously—it helps prevent sticking and adds flavor

Instructions

Preheat and prep:

Get your oven to 375°F and dice all your vegetables before you start cooking—mise en place makes everything smoother.

Sauté the aromatics:

Heat that olive oil in your ovenproof skillet over medium heat, then add onion and bell pepper for 2 minutes until they start softening.

Add remaining vegetables:

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

Warm the chicken:

Add diced chicken and cook for just 1 minute to take the chill off—you don't want to dry it out.

Whisk the eggs:

In a separate bowl, beat eggs with milk, salt, pepper, oregano, and thyme until everything's well combined.

Combine and set the edges:

Pour egg mixture evenly over everything in the skillet, then cook on the stovetop for 3-4 minutes until you see the edges starting to firm up.

Finish in the oven:

Sprinkle both cheeses on top and transfer to the oven for 12-15 minutes until the center's set and the top is golden.

Rest and serve:

Let it cool for 5 minutes—this slice of patience makes all the difference for clean servings.

Save

My neighbor texted me at 7pm last Tuesday, completely exhausted after a long day, so I brought over a slice of this still slightly warm. She texted back ten minutes later saying it was exactly what she needed, and honestly, isn't that the whole point of feeding people?

Make It Your Own

Swap the chicken for leftover turkey, or skip it entirely and add more vegetables for a vegetarian version. Mushrooms, cherry tomatoes, or even artichoke hearts work beautifully here—whatever you have that needs using.

Serving Suggestions

A crisp green salad with vinaigrette cuts through the richness perfectly. Or serve it alongside roasted potatoes for a heartier meal, or with fresh fruit for a lighter brunch spread.

Storage and Reheating

This frittata keeps beautifully in the refrigerator for up to 4 days. Reheat individual slices in the microwave for 30-45 seconds, or cold straight from the fridge—it's delicious either way.

• Wrap slices individually for grab and go breakfasts throughout the week
• The flavors actually develop overnight, making it even better the next day
• Freeze cooked portions for up to 2 months if you want to meal prep ahead

Save

There's something deeply satisfying about turning humble leftovers into a meal that feels special. Hope this becomes your comfort food too.

Your Recipe Questions Answered

→ Can I make this frittata ahead of time?

Yes, frittata stores beautifully in the refrigerator for up to 3 days. Slice and reheat individual portions in the microwave or enjoy cold. The flavors actually develop and improve after resting overnight.

→ What vegetables work best in this dish?

Baby spinach, bell peppers, zucchini, and red onion provide excellent texture and flavor. You can also add mushrooms, cherry tomatoes, asparagus, or broccoli rabe depending on season and preference.

→ Can I use leftover chicken?

Absolutely! Leftover cooked chicken, rotisserie chicken, or even turkey works perfectly. Just dice it into bite-sized pieces and warm it briefly with the vegetables before adding the egg mixture.

→ Do I need an ovenproof skillet?

An ovenproof skillet is essential since the frittata starts on the stovetop and finishes in the oven. Cast iron or stainless steel skillets work well. Alternatively, cook on stovetop until mostly set, then transfer to a baking dish.

→ How do I know when the frittata is done?

The center should be set with no liquid egg remaining, and the top should be slightly golden. A knife inserted into the center should come out clean. The edges will pull away slightly from the pan sides.

→ Is this dish gluten-free?

Yes, this frittata is naturally gluten-free when made with gluten-free cheeses. Always check labels on pre-shredded cheese and seasonings to ensure no gluten-containing additives are present.