Preheat oven: Set oven to 350°F (180°C). Grease a 12-cup muffin tin or use silicone liners.
Mix eggs and milk: In a large bowl, whisk together eggs, milk, salt, black pepper, garlic powder, and paprika until smooth.
Add vegetables and cheese: Stir in the chopped vegetables and shredded cheese until evenly mixed.
Fill muffin cups: Pour mixture into muffin cups, about 3/4 full each.
Bake: Bake for 20–25 minutes, until tops are golden and a toothpick comes out clean.
Cool and serve: Let muffins cool for 5 minutes before removing from the tin. Enjoy warm, or store for later.