Prep Time: 15 minutes
Cook Time: 20–25 minutes
Total Time: 40 minutes
Servings: 8–12 slices
Difficulty: Easy

Ingredients

For the Frittata Base

• 18 large eggs
• 1 cup whole milk or half-and-half
• 1 teaspoon kosher salt
• ½ teaspoon freshly ground black pepper
• ½ teaspoon garlic powder
• ½ teaspoon onion powder
• ¼ teaspoon smoked paprika (optional)
• 1 cup shredded cheddar cheese
• ½ cup grated Parmesan cheese

Vegetable Filling

• 1 tablespoon olive oil
• 1 medium bell pepper, diced
• 1 small zucchini, diced
• 1 cup cherry tomatoes, halved
• 1 small red onion, thinly sliced
• 2 cups baby spinach, chopped
• 2 tablespoons fresh parsley, chopped
• 1 tablespoon fresh chives, chopped

Optional Add-Ins

Choose your favorites:

• 1 cup cooked breakfast sausage
• 1 cup diced ham
• 6 slices cooked bacon, crumbled
• 1 cup mushrooms, sautéed
• ½ cup feta cheese
• ½ cup goat cheese
• ½ cup roasted red peppers
• 1 cup cooked broccoli

Equipment

• Large rimmed sheet pan (13×18 inches)
• Parchment paper
• Large mixing bowl
• Whisk
• Large skillet
• Spatula
• Knife and cutting board

Instructions

Step 1: Prepare the Oven and Pan

Preheat your oven to 375°F (190°C).

Line a large rimmed sheet pan with parchment paper and lightly grease it with olive oil or cooking spray.

Step 2: Cook the Vegetables

Heat olive oil in a skillet over medium heat.

Add the bell pepper and red onion. Cook for 3–4 minutes until slightly softened.

Add the zucchini and cook for another 2–3 minutes.

Stir in the spinach and cook until just wilted.

Remove from heat and allow the vegetables to cool slightly.

Step 3: Prepare the Egg Mixture

In a large bowl, whisk together:

• Eggs
• Milk
• Salt
• Black pepper
• Garlic powder
• Onion powder
• Smoked paprika

Whisk until smooth and fully combined.

Stir in the cheddar cheese, Parmesan cheese, fresh herbs, and cooked vegetables.

Step 4: Pour into the Sheet Pan

Pour the egg mixture evenly into the prepared sheet pan.

Arrange any additional toppings, such as cooked bacon, sausage, ham, tomatoes, or extra cheese, across the surface.

Step 5: Bake

Bake for 20–25 minutes, or until:

• The eggs are fully set
• The center no longer jiggles
• The edges are lightly golden
• The top is slightly puffed

Avoid overbaking, as this can make the eggs dry.

Step 6: Cool and Slice

Let the frittata rest for 5–10 minutes before slicing.

Cut into squares or rectangles and serve warm.

Serving Ideas

Serve your Sheet-Pan Frittata with:

• Toast or English muffins
• Fresh fruit salad
• Roasted potatoes
• Green salad
• Avocado slices
• Salsa or hot sauce
• Yogurt sauce
• Fresh herbs

Tips for the Best Sheet-Pan Frittata

• Use a large sheet pan with raised edges to prevent spills.
• Cook watery vegetables before adding them to avoid a soggy frittata.
• Don’t overfill with too many mix-ins—eggs should remain the star.
• Freshly shredded cheese melts better than pre-shredded varieties.
• Let the frittata rest before slicing for cleaner pieces.
• Add delicate herbs after baking for the freshest flavor.

Variations

Mediterranean Sheet-Pan Frittata

Use feta cheese, spinach, roasted peppers, olives, tomatoes, and oregano.

Bacon Cheddar Frittata

Add crispy bacon, sharp cheddar, green onions, and a sprinkle of smoked paprika.

Mushroom Swiss Frittata

Combine sautéed mushrooms, Swiss cheese, thyme, and caramelized onions.

Southwest Frittata

Add black beans, corn, jalapeños, pepper jack cheese, and cilantro. Serve with salsa.

Spring Vegetable Frittata

Use asparagus, peas, spinach, goat cheese, and fresh herbs.

High-Protein Breakfast Frittata

Add turkey sausage, cottage cheese, extra egg whites, and vegetables for a protein-rich option.

Storage

Store leftover frittata slices in an airtight container in the refrigerator for up to 4 days.

Reheat in the microwave for 30–60 seconds or warm in a 350°F (175°C) oven for 8–10 minutes.

To freeze, wrap individual slices tightly and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.

Nutrition (Approximate Per Serving)

• Calories: 260
• Carbohydrates: 6g
• Protein: 19g
• Fat: 18g
• Saturated Fat: 7g
• Cholesterol: 300mg
• Fiber: 2g
• Sugar: 3g
• Sodium: 480mg
• Calcium: 20% DV
• Iron: 10% DV

Frequently Asked Questions

Can I make this sheet-pan frittata ahead of time?
Yes. It is one of the best make-ahead breakfasts. Bake it, cool completely, slice, and refrigerate or freeze portions for quick meals.

Can I use egg whites instead of whole eggs?
Yes. Replace some or all of the whole eggs with egg whites for a lighter version, though the texture will be slightly less rich.

Why is my frittata watery?
Usually because vegetables released excess moisture. Cook vegetables first and drain ingredients like spinach, mushrooms, and tomatoes before adding them.

Can I make it dairy-free?
Yes. Use a dairy-free milk alternative and replace cheese with a dairy-free cheese or nutritional yeast.

Final Thoughts

This Sheet-Pan Frittata is a simple, flexible, and delicious way to feed a crowd or prepare breakfast for the week. With fluffy eggs, melted cheese, fresh vegetables, and endless customization options, it delivers all the flavor of a classic frittata with the convenience of one-pan baking. It’s the perfect recipe for busy mornings, brunch gatherings, and easy everyday meals.