½ cup butter
2 cups brown sugar, light or dark
1 tablespoon vanilla
¼ cup milk
2 eggs
2 cups flour
2 teaspoons baking powder
1½ teaspoons salt
Preheat oven to 350 F.
Melt butter in 2-quart saucepan. Remove from heat and add brown sugar. Mix well. Add vanilla, milk, and eggs. Mix well. Add flour, baking powder, and salt. Mix until just combined.
Spread batter into a greased 9 x 13 pan. Bake approximately 30 minutes. Remove from oven when brownies are lightly browned and edges are just beginning to pull away from the sides of the pan. Do not overbake or brownies will be hard once they cool.
For variety, add 1 cup chopped nuts, toffee chips, butterscotch chips, or chocolate chips.