Preheat the oven to 375°F (190°C) and grease a standard 12-cup muffin tin with non-stick spray or butter.
In a large mixing bowl, whisk together the cottage cheese and beaten eggs until the mixture is uniform.
In a medium bowl, whisk the flour, baking powder, salt, garlic powder, and black pepper to ensure even distribution of leavening agents.
Gradually fold the dry ingredients into the wet cottage cheese mixture using a spatula until just moistened.
Stir in the shredded cheddar cheese, sliced scallions, and diced red bell pepper until evenly incorporated.
Distribute the batter equally among the 12 muffin cups, filling each to approximately three-quarters capacity.
Bake for 22 to 25 minutes until the tops are golden brown and a thermometer inserted into the center of a muffin reads 200°F (93°C).
Allow muffins to rest in the tin for 5 minutes before transferring to a wire rack to prevent steaming and structural collapse.