||Preheat oven to 375 degrees. Spray mini muffins pans (recipe makes 36 muffins) and set aside.
In a large bowl, combine flour, cornmeal, sugar, baking powder, salt, and chili powder. In a separate bowl, combine cheese, sour cream, onions, corn, and egg. Add to flour mixture, stirring just until moistened.
Spoon batter into muffin pans. Bake for about 10 minutes or until browned. Cool in pan for about 2 minutes. Then, remove from pans and cool muffins on wire rack.