This is a great dish for a grab-and-go breakfast! For a make-ahead version, simply allow to cool completely, before diving into individual portions and freezing for future enjoyment. When you're ready to cook them, simply microwave for 60-90 seconds.
Preheat oven to 350 degrees. Spray the cups of a 12-cup muffin pan generously with non-stick cooking spray.
Finely chop roasted red bell pepper, green onion, and spinach; divide evenly among muffin cups. Top with feta cheese.
Whisk eggs with milk, Italian seasoning, salt and pepper in a large bowl.
Pour egg mixture evenly among muffin cups and bake until eggs are set, about 22-25 minutes.
Cool in muffin time for 5 minutes before removing.
NOTE: Be sure to coat muffin pan cups thoroughly so that eggs can easily be removed. A toothpick can be used around the edges to help release them from the tim. A silicone muffin pan can be useful here too, but you’ll still need to coat the cups with non-stick cooking spray.