INGREDIENTS
2 tbsp
unsalted butter, softened (I use Challenge)
1/2 cup
packed brown sugar
1
egg yolk
1 tsp
vanilla extract
1/4 tsp
baking powder
1/8 tsp
salt
1/3 cup
all purpose flour
1/2 cup
mix-ins (butterscotch or chocolate chips, coconut, chopped candy, nuts, etc)