Step 1

Preheat oven to 350°F. Line an 8 x 8-inch baking pan with parchment paper. Allow for overhang for easy removal.

Step 2

In a large bowl, combine cookie mix, butter, and egg. Stir until well combined.

Step 3

Press 2/3 of cookie dough into the bottom of the prepared pan in an even layer.

Step 4

Smooth the marshmallow fluff over the dough with an offset spatula.

Step 5

Sprinkle the crushed graham crackers over the marshmallow fluff, and sprinkle with chocolate chips.

Step 6

For the top layer, gather chunks of remaining cookie dough, flatten with your fingers, and scatter across the top. The dough will not fully cover the marshmallow layer because we want some of that layer to show through.

Step 7

Bake for 25-28 minutes until cookie dough is lightly golden brown on the edges. Scatter a few more chocolate chips across the top if desired. Let cool completely. Use parchment paper to lift the bars out of the pan and cut into 16 squares.

Step 8

Enjoy!