1/3 cup butter
2/3 cup chunky peanut butter
1 cup firmly packed brown sugar
2 eggs
1 teaspoon vanilla
1 cup flour
1/2 teaspoon baking soda
1/2 teaspoon salt
1 1/4 cups oatmeal, quick or old fashioned
Beat butter, peanut butter, and brown sugar together until light and fluffy. Blend in eggs and vanilla.
In a separate bowl combine flour, baking soda, and salt; mix well. Add to wet mixture. Stir in oatmeal.
Spread into greased 13×9-inch baking pan. Bake in preheated 350-degree oven for 20 to 22 minutes.