Preheat the Oven: Preheat the oven to 350°F (175°C).
Prepare the Muffin Tin: Grease the muffin tin generously with nonstick cooking spray or butter. Pro Tip: Consider lining your muffin tin with paper liners or silicone cups to ensure easy removal, according to My Pocket Kitchen.
Prepare the Vegetables: In a large bowl, combine the diced bell pepper, tomatoes, onion (or green onions), spinach, cheese, garlic powder, salt, and black pepper.
Combine with Egg Whites: Pour the liquid egg whites (or whisked whole eggs) into the vegetable mixture and mix thoroughly to combine.
Fill Muffin Cups: Use a ladle to pour the mixture into the prepared muffin cups, filling each approximately ¾ full.
Bake: Bake for 25-30 minutes, or until the centers are set and a toothpick inserted comes out clean. Optional: For a fluffier texture, create a steam bath by placing a baking dish filled with hot water on the bottom rack of your oven while the egg bites bake.
Cool and Serve: Allow the egg bites to cool in the pan for 10 minutes before removing them. Serve warm and enjoy!
