1Preheat oven to 350 degrees. Grease a nine by thirteen by two inch baking dish.
2Using an electric mixer, cream the butter, sugars, and peanut butter. Add the egg and vanilla. Sift the flour, baking soda and salt together. Mix the oatmeal into the flour mixture and stir into the creamed mixture.
3Spread the batter into the prepared pan. Sprinkle the chocolate chips over the batter...Bake for 20 to 25 minutes.
4Mix the frosting ingredients ogether until smooth and spread over the warm peanut butter bars.
Cool completely before cutting.
Makes 3 dozen one by three bars or more if you cut them smaller like pieces of fudge.