Preheat the oven: Begin by preheating your oven to 400°F (200°C). While it’s warming up, you can prepare your ingredients.
Prepare the pan: Grease a sheet pan (approximately 18x13 inches) with olive oil or cooking spray to ensure easy removal after cooking.
Whisk the eggs: In a large bowl, whisk together the 8 large eggs and 1/4 cup of milk. Don’t forget to season with salt and pepper to taste. This is where you can add any extra spices if you’re feeling adventurous!
Mix in the veggies: Stir in the diced bell peppers, onions, and chopped spinach until well combined.
Pour and spread: Pour the egg mixture into the prepared sheet pan, spreading it out evenly so everything bakes uniformly.
Add cheese: Sprinkle the shredded cheese on top, making sure to cover the egg mixture evenly.
Bake: Place the sheet pan in the oven and bake for 20-25 minutes or until the eggs are set and the top is lightly golden brown.
Cool and serve: Once cooked, let it cool for a few minutes before slicing into squares. Serve warm and enjoy!