Spray a mini muffin tin with nonstick spray and set aside.
Preheat your oven to 350° F.
In a large mixing bowl, prepare the brownies, according to box directions.
1 box brownie mix + ingredients on the back
Once the brownies have baked and cooled, heat your oven to 350° F again.
Remove the brownie bites from the muffin tin, and place them onto a parchment lined baking sheet.
Add 3-4 mini marshmallows to each brownie bite.
1 1/2 cups mini marshmallows
Return the bites to the oven and bake 2-3 minutes, until the marshmallows begin to puff up.
Remove from the oven and prepare the ganache.
In a microwave safe bowl, stir together chocolate chips and heavy cream.
4 ounces semi sweet chocolate chips, 2 Tablespoons heavy cream
Add the butter and microwave for 30 seconds.
1 Tablespoon unsalted butter
Stir well, and microwave for 15 seconds more.
The ganache should be melted and well combined. If needed, you can microwave for another 30 seconds to melt completely.
Stir, and use a spoon to drop a little ganache over top of each brownie bite.
Sprinkle with sprinkles, if using, as you go.
Christmas sprinkles