Preheat oven to 375. Grease muffin cups.

Combine flour and sugar.

Melt butter and pour over flour mixture, mixing until crumbly. Set aside 1 cup of mixture for topping. To the remainder of flour mixture, add the rest of the ingredients, stirring just until moistened.

Fill muffin cups 3/4 full.
Sprinkle reserved mixture over top of each muffin.
Bake at 375 for 15-20 minutes. Makes 12 muffins.