Preheat your oven to 350 degrees and grease a 8x8" baking pan with a non stick cooking spray.

Use a hand or stand mixer to beat your brown sugar and butter together until creamy.

Then add in your egg and vanilla extract.

Now mix in your flour and baking powder.

Fold in your chocolate chips, marshmallows, and graham crackers.

Press your cookie dough evenly into the bottom of your greased pan.

Bake for 25 minutes, let cool, and slice into squares.