Soft and chewy s'mores bars

Step 1

1 Heat oven to 350°F. Grease an 8 inch square baking pan.
2 Beat butter and sugar together until well blended in a large bowl. Add egg and vanilla; beat well.
3 In another bowl stir together flour, graham cracker crumbs, baking powder, and salt. Add to butter mixture, beating until blended.
4 Press half the dough into the prepared pan. Bake 15 minutes.
Unwrap chocolate bars; arrange over baked layer. They may not quite all fit, you may be forced to eat a couple pieces. Sprinkle with marshmallows. ( You can break small chunks of the dough off and sprinkle it on top. I chose to take pieces in my fingers and flatten them out a bite and then lay them on top of the marshmallows to cover it better.) Scatter remaining dough over the marshmallows, forming a top layer.
5 Bake 10- 15 minutes or until just lightly browned. Cool compleletly before cutting.