1 stick butter
1 pound brown sugar
3 eggs
2 1/4 cups flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1 teaspoon vanilla
12 oz bag of chocolate chips
Melt butter with sugar in a large pan.  Add eggs, one at a time to sugar mixture; mix well after each egg. Sift four, baking powder, baking soda, and salt. Add sifted dry ingredients, vanilla and chocolate chips.  Mix well.  Pour mixture in a 9 X 13 inch pan.  Bake at 350 degrees for 30 - 35 minutes.  Cool and cut to serve.