Preheat oven to 350℉ (175°C). Grease a silicone muffin pan and place it on a baking sheet.
Finely chop spinach and roasted red bell peppers; add a spoonful to each muffin cup.
Blend egg whites, cottage cheese, Monterey Jack, feta, salt, and pepper for 30–45 seconds until creamy and bubbly.
Fill muffin cups ¾ full with egg mixture, stirring lightly to combine with veggies.
Pour 2 cups hot water onto the baking sheet under the muffin pan.
Bake 25–30 minutes until set. Let cool 5 minutes before removing.
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