The base of these bars is a chewy oatmeal that's slightly sticky, almost like a cross between a sweet granola and a Rice Krispie Treat. The frosting is a perfect hybrid of milk chocolate and creamy peanut butter.
Cream the butter, sugars and vanilla in a bowl. Add in the egg and beat well. Add in the oats and mix with a spatula until well blended. Spread out evenly in an 8x8 baking pan and bake for about 20 minutes, until just golden. Let cool slightly before frosting. Wipe out the oatmeal bowl and add the chocolate chips and peanut butter. Microwave on short bursts, stirring until the chocolate just melts and the mix is smooth and creamy. Spread over the partially cooled base. Refrigerate until completely firm, several hours. Enjoy straight from the refrigerator.