1/4 cup (1/2 stick) butter
1/2 cup sugar
1 egg
1/2 cup milk
1 1/2 cups all-purpose flour
2 1/2 tsp. baking powder
salt
1/2 tsp. vanilla

Mix well. Prepare cupcake tin with paper liners. Fill 2/3rds full. Bake at 375°F to 400°F for 20 minutes.