Start by bringing a kettle of water to a boil. Meanwhile, preheat your oven to 300°F, positioning one rack in the center and another on the lowest level.
Place a 9x13-inch metal or ceramic baking dish on the lower rack and carefully fill it halfway with the boiling water. This added steam will help the egg bites cook evenly and develop a soft, custard-like texture.
Generously coat a nonstick muffin pan with cooking spray to prevent sticking.
In a large bowl or tall container, combine the egg whites, cottage cheese, mozzarella cheese, cornstarch, salt, and a dash of hot sauce. Use an immersion blender to blend the mixture until completely smooth, about 30 seconds to 1 minute. If you don’t have an immersion blender, a regular blender works just as well—simply blend on high until smooth.
1½ cups egg whites, 1¼ cups 4% milkfat cottage cheese, 1¼ cups shredded mozzarella cheese, 2 tablespoons cornstarch, ½ teaspoon salt, ½ teaspoon hot sauce
Pour the blended egg mixture into the prepared muffin pan, filling each cup nearly to the top. Evenly distribute the roasted red peppers and scallions over the batter, then gently press them down with a spoon so they don’t sit on the surface.
3 tablespoons diced roasted red bell pepper, ¼ cup chives
Bake on the middle rack for 20 to 25 minutes, or until the egg bites are fully set. You’ll know they’re done when they begin pulling away from the edges of the pan and puffing up. It’s normal for them to rise unevenly, but they will settle as they cool.
Once out of the oven, allow the egg bites to rest in the pan for 5 minutes. Use a small spoon to loosen the edges and carefully lift them onto a plate. Serve warm.