Preheat oven to 200 degrees and spray a 12-cavity nonstick muffin tin with cooking spray.
Put the first 8 ingredients (from the egg whites to the hot sauce) in a blender and process until smooth.
Divide egg mixture evenly between cavities in prepared muffin tin. Top evenly with chopped roasted red peppers, spinach, and scallions. Use a spoon to gently press toppings into egg mixture a bit.
Place muffin tin in oven and cook for 65-70 minutes, until egg bites are set in the middle and are starting to turn golden at edges.
Let rest for a couple minutes and then lightly run a knife along the edge of each egg bite to remove from tin.
Egg bites can be stored in an airtight container in the fridge for up to 4 days. They can easily be heated up in the microwave or oven.