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Sheet Pan Frittata

This Sheet Pan Frittata is an easy breakfast recipe made with eggs, cheddar cheese, bacon, and mushrooms baked until fluffy and golden. Perfect for meal prep, brunch, or busy mornings when you need something hearty with easy cleanup.
Print Recipe
Delicious cheesy mushroom breakfast casserole with green onions.
Prep Time:10 minutes
Cook Time:15 minutes
Total Time:25 minutes

Ingredients

  • 8 eggs
  • 2 tbsp milk
  • Salt and pepper to taste
  • ½ cup cheddar cheese
  • ½ cup sliced mushrooms cut in half
  • ¼ cup bacon pieces
  • Sliced green onion to garnish

Instructions

  • Step 1: Prepare the Oven and Pan - Start by preheating your oven to 350 degrees. While that heats up, line a small rimmed baking sheet with parchment paper. Let the parchment overlap the edges a little so it is easy to lift the frittata out later. Trust me on this part because it makes cleanup unbelievably simple. I learned that lesson after scrubbing baked egg off pans more times than I care to admit.
  • Step 2: Prep the Vegetables - Slice your mushrooms and green onions before you get started with the eggs. I like cutting the mushrooms into smaller pieces so every bite gets a little bit of everything. Save the green onions for garnish at the end because they stay brighter and fresher that way.
  • Step 3: Whisk the Eggs - Crack the eggs into a small bowl and add the milk, salt, and pepper. Whisk everything together until the mixture looks smooth and evenly combined. You do not need fancy equipment here. A fork works just fine. The key is making sure the yolks and whites are fully mixed so the frittata bakes evenly.
  • Step 4: Pour and Layer the Ingredients - Pour the egg mixture into the parchment lined baking sheet. Sprinkle the cheddar cheese evenly across the top first, then add the bacon pieces and mushrooms. Spreading everything out helps each slice get a balanced mix of toppings. Around our house somebody always tries to sneak extra cheese onto one corner of the pan.
  • Step 5: Bake Until Set - Carefully place the baking sheet into the oven and bake for about 15 minutes. The eggs should look set in the center and lightly golden around the edges. If you gently shake the pan, the middle should not jiggle much. Every oven is a little different, so keep an eye on it during the last few minutes.
  • Step 6: Garnish and Serve - Once the frittata comes out of the oven, sprinkle sliced green onions over the top while it is still warm. Let it cool for a couple of minutes before slicing into squares. We love serving this on toasted English muffins or thick slices of buttered toast. It turns a simple breakfast into something that feels extra comforting.

Notes

Substitutions

  • Turkey bacon instead of regular bacon: This is a lighter option that still gives plenty of savory flavor.
  • Mozzarella instead of cheddar: Mozzarella creates a milder and extra melty texture.
  • Spinach instead of mushrooms: Fresh spinach works beautifully if you want more greens in the recipe.
  • Half and half instead of milk: Using half and half makes the eggs even richer and creamier.
  • Chives instead of green onion: Chives give a softer onion flavor with the same fresh finish.

Variations

  • Veggie packed version: Add diced bell peppers, spinach, or zucchini for extra color and flavor.
  • Southwestern style: Mix in pepper jack cheese, cooked sausage, and diced jalapeños for a little kick.
  • Ham and cheese version: Swap the bacon for diced ham for a classic breakfast flavor.
  • Mediterranean twist: Use feta cheese, spinach, and chopped tomatoes for a fresh variation.
  • Breakfast sandwich style: Serve slices inside toasted English muffins with extra cheese melted on top.

Tips and Tricks

  • Use parchment paper: This keeps the eggs from sticking and makes cleanup much easier.
  • Do not overbake: Pull the frittata out once the center is set so it stays soft and tender.
  • Cook bacon ahead of time: Having bacon ready to go makes this recipe even faster on busy mornings.
  • Whisk thoroughly: Fully mixed eggs create the best texture throughout the whole pan.
  • Let it rest before slicing: Giving the frittata a few minutes to cool helps the slices hold together nicely.

Serving Ideas

  • With toasted English muffins: This is our favorite way to serve it because the crispy bread pairs perfectly with the soft eggs.
  • Alongside fresh fruit: Fruit adds a fresh and bright balance to the rich flavors.
  • With roasted potatoes: Crispy breakfast potatoes turn this into a filling brunch spread.
  • Topped with hot sauce: A little hot sauce gives every bite extra flavor and warmth.
  • Paired with coffee and juice: Simple drinks complete the cozy breakfast feel.

Storage and Make Ahead Tips

  • Store in the fridge: Keep leftovers in an airtight container for up to four days.
  • Reheat gently: Warm slices in short bursts in the microwave so the eggs stay tender.
  • Freeze individual portions: Wrapping slices separately makes quick breakfasts easy during busy weeks.
  • Prep ingredients ahead: Slice mushrooms and cook bacon the night before to save time in the morning.
  • Use for meal prep: Portion slices into containers with fruit or toast for grab and go breakfasts.
Servings: 8 servings