Caramel Cinnamon Muffins

3 tablespoons butter
2/3 cup brown sugar
2 cup sifted flour
3 teaspoon baking powder
1/2 teaspoon salt
1 teaspoon cinnamon
1 egg
1 cup milk
2 tablespoons shortening, melted
Grease muffin pans and place 1/2 teaspoon of butter and 1 teaspoon brown sugar in each cup.  Sift flour, baking powder, salt and cinnamon together. Beat egg; add milk, shortening and remaining 1/2 cup brown sugar.  Add to sifted dry ingredients, stirring only enough to dampen all the flour. Fill prepared muffin pans 3/4 full and bake at 425 degrees for 20 minutes.