1Preheat oven to 400°F
Spray a 12 count miniature muffin tin with cooking spray.
2Using a whisk, blend egg, milk, and oil together in small bowl.
Add cornbread mix, baking powder, and baking soda.
Continue to whisk while adding onion and bell pepper.
Pour or spoon into mini muffin tins sprayed with cooking spray.
3Bake at 400° for 15 minutes. Flip muffins out onto cooling rack.