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 used EnerG rice flour, and also a combination of brown rice flour, coconut flour and almond 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.
For a low carb version, substitute buckwheat or almond flour (or a combination of both), and Brown Sugar Splenda instead of sugar.
Enjoy!