- 1 Preheat the oven to 350°F (175°C). Grease or line an 8×8-inch baking pan.
- 2 Beat softened butter, brown sugar, and granulated sugar until creamy.
- 3 Add the egg and mix until combined.
- 4 Stir in flour and graham cracker crumbs until dough forms.
- 5 Press half of the dough into the bottom of the pan.
- 6 Layer chocolate bars and spread marshmallow fluff on top.
- 7 Crumble remaining dough over the marshmallow layer.
- 8 Bake for about 25 minutes until golden.
- 9 Cool for at least 10 minutes before slicing.
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