These are very easy to make. The original recipe calls for a 9x13 inch pan, but that makes a very thin bar. For a slightly thicker, easier to spread crust, use a 9 inch square pan.
1cupall-purpose flour, stir before measuring and do not pack into the cup (4.5 oz by weight)
1cupquick oatsnot instant
2cupssemisweet chocolate chips or 12 ounce chopped milk or dark chocolate
Instructions
Preheat the oven to 350 degrees F. Line a 9x13 inch pan with parchment paper or nonstick foil. For a slightly thicker bar, use a 9 inch square pan.
In a mixing bowl, stir together the butter, peanut butter, granulated and brown sugar, egg, vanilla, baking soda and salt. When thoroughly mixed, add the flour and stir until incorporated. Stir in the oats.
Press the batter across the bottom of the prepared pan and bake for 18 to 20 minutes or just until it appears set and the edges are browned.
Remove from oven and immediately scatter chocolate chips over the top. Put back in the oven for 1 minute. Remove from oven and let the chips sit until they are soft, then gently spread the softened chips with the back of a spoon. Let cool at room temperature for about 20 minutes, then put in the refrigerator to set the chocolate. Sprinkle with chopped nuts while the chips are still semi-soft if desired.