Chocolate Swirl Cupcakes

Ingredients

1/4 cup butter	2 cups flour
1 cup sugar	1 T baking powder
2 large eggs	1/2 tsp salt
1 1/4 cup sour cream	2 1/2 cups flour
1/4 cup semi-sweet chocolate chips	1 tsp butter

Directions
Cream butter, sugar, eggs and vanilla for 3 minutes.
Mix in flour, baking powder, salt and sour cream. Put in cupcake tins.
Mix and melt in a separate bowl chocolate chips and butter. Spoon on top of batter and swirl.
Bake at 400°F 20 minutes for regular muffins or 30 minutes for large cupcakes.

Source: My mother-in-law