Cream together sugars and butter. Add vanilla,eggs and 1 cup peanut butter and mix well.
Stir in oats,flour,baking soda, and salt. Spread dough in pan and bake 15 minutes until golden brown.
While hot spread remaining 1 1/2 cups peanut butter on top.Cool.
Can frost with chocolate frosting; 1/2 cup butter,1/4 cup milk,1 teaspoon vanilla,3 tablespoons cocoa,2-3 cups powdered sugar. Beat all ingredients till smooth. Can add more milk or powdered sugar to your likeing