To make the Brownie Layer:

Cup of Yum
1. Preheat oven to 350 degrees. Butter and flour or use baking spray a 13x9 pan.
2. In a large bowl or your stand mixer, add the butter, sugar, vanilla and eggs.
3. Add in the cocoa powder, 3/4 cup dark chocolate chips and salt and until well combined.
4. Add in the flour until just combined (don't overbeat).
5. Bake about 25-28 minutes or just until done in the center.
6. Add the bag of marshmallows over the top.
7. In a microwave safe bowl add the 2 cups dark chocolate chips and butter and melt in 30 second increments until fully melted.
8. Add in the Nutella and whisk completely.
9. Add in the Rice Krispies Cereal and fold to combine with a spatula.
10. Add evenly over the top of the marshmallow layer and pat down slightly to form a cohesive layer.
11. Refrigerate until completely chilled.
12. For even easier cutting, you can put the brownies in the freezer for a couple of hours to let the marshmallows harden a bit to get nice clean cuts between brownies.