Preheat oven to 350 degrees. Spray 12-cup muffin pan with nonstick cooking spray.
Wilt spinach in a skillet with olive oil for 2 to 3 minutes.
In large bowl, beat eggs and milk. Stir in cheese, spinach, and roasted red pepper.
Divide batter among muffin pan cups about 1/4 cup each. Top with prosciutto, sprinkle with red pepper flakes, and bake 20 to 25 minutes or until just set in center.
Cool on rack 5 minutes, then remove from cups. Serve warm. Enjoy!