Preheat oven to 400 degrees F (200 degrees C). Spray 12 muffin cups with cooking spray or line with paper liners.
Combine eggs, spinach, red bell pepper, ham, egg whites, feta cheese, water, salt, and pepper in a large bowl. Ladle egg mixture into the prepared muffin cups.
Bake in the preheated oven until set in the middle, 20 to 25 minutes.
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