Melt 1 stick Butter (I use Lands of Lakes brand); Cream together well: Butter, white granulated Sugar and light Brown Sugar in medium sized mixing bowl; Blend in egg; Stir into bowl: peanut butter (Jif creamy brand w/o nuts) and Vanilla; Mix in self rising Flour, then Oatmeal (be sure to use Quaker Quick 1 minute Oats only). Spoon and press into 9 x 13 baking pan (use coated pan so you don't have to lightly grease the pan); Bake at 350 degree preheated oven, middle rack for 18-22 minutes (until barely light brown for soft chewy bar, up to 25 minutes for more crunchy); Take out of oven and while hot, immediately sprinkle 1+ cup semi-sweet chocolate chips to melt on top of cookie bar, with knife smooth out a thin layer across top, In small bowel Mix until smooth: 10x powdered sugar, creamy peanut butter and 2-4 tablespoons of 2% or whole milk to drizzle over melted chocolate...or just pour on top and swirl it all together to make an icing. Allow to cool for 30 minutes if you can wait that long.