I always double this recipe because it goes so quick.

This is from The Joy of Cooking.

Preheat oven to 350 degrees

Melt in a saucepan: 1/4 Cup butter

Stir until dissolved: 1 Cup brown sugar.

Cool these ingredients slightly, then beat in well: 1 egg and 1 tsp. vanilla.

Sift, then measure: 1/2 Cup flour (I use EnerG rice flour but you can use any kind).  Resift it with: 1 tsp. double-acting baking powder and 1/2 tsp. salt.

Stir these ingredients into the butter mixture.  Add 1/2 - 1 Cup finely chopped nuts or 3/4 Cup grated coconut.  Chopped dates and figs may be substituted for the nuts.  Use a little of the flour over them. 

(I don't add anything because they are great just plain. I'm sure that you could also add chocolate or butterscotch chips, too)

Pour the batter into a greased 9 X 9-inch pan.  Bake about 20-25 minutes.  Cut into bars when cool.

Enjoy!