1 tsp baking powder
1/4 tsp salt
2 king-sized Hershey's milk chocolate bars (if you want a more subtle chocolate flavor use regular sized chocolate bars; enough to fit)
1 1/2 cups marshmallow creme/fluff (7 1/2 oz jar)
Directions:1. Preheat oven to 350°F. Grease an 8-inch square baking pan.
2. In a large bowl, cream together butter and sugar until light. Beat in egg and vanilla. In a small bowl, whisk together flour, graham cracker crumbs, baking powder and salt. Add to butter mixture and mix at a low speed until combined.
3. Divide dough in half and press half of dough into an even layer on the bottom of the prepared pan. Spread marshmallow creme or fluff on first layer of dough. Next place the Hershey’s bars - they should fit perfectly side by side, but break the chocolate (if necessary) to get it to fit in a single layer no more than 1/4 inch thick. (Here is where I sprinkled chocolate chips instead!) Place remaining dough in a single layer on top of the chocolate. This part can be tricky. I smashed the dough into little disks and pieced them across the top of the chocolate until the entire pan was covered.
4. Bake for 25-30 minutes, until lightly browned. Cool completely before cutting into bars.Makes 16 cookie bars.