Butterscotch Bonanza Bars

Butterscotch Bonanza Bars
1/2 cup butter or hard margarine, melted
2 cups light brown sugar, packed
2 teaspoons baking powder
1 teaspoon salt
1 teaspoon vanilla extract
2 large eggs, lightly beaten
1 1/2 all-purpose (plain) flour
1 cup chopped nuts*
2 cups butterscotch chips*

*Both of these ingredients are optional, but the bars are pretty plain without at least one of them. Instead of butterscotch chips, chocolate chips, miniature chocolate chips, or white chocolate chips can be used, alone or in combination. Feel free to experiment  In this case, my mother used no nuts and chocolate chips when she made them.

Preheat oven to 350◦F. Grease or line a 9x13 inch baking pan. 
In a large bowl, cream the butter and sugar. Stir in the baking powder and salt, then the vanilla, the eggs, then the flour in half cup increments. Mix in the nuts and/or chips. Spread batter into prepared pan. Bake for 20 to 25 minutes.

Fluke, Joanne. "Butterscotch Bonanza Bars." Recipe. Devil's Food Cake Murder, New York: Kensington, 2011. 29-32.