First things first, those brownies need to be made. Follow this simple process:

Preheat your oven to 350°F (175°C). This is important—we want our brownies to bake perfectly.

In a medium bowl, combine the brownie mix, water, egg, and canola oil. Mix until well combined. The consistency should be smooth with no dry ingredients visible.

Spray a baking dish with non-stick cooking spray to ensure easy removal later. Pour the brownie batter into the dish and spread it evenly.

Bake for about 25-30 minutes. A toothpick should come out with a few moist crumbs when they’re done. Let them cool while we prep the hot chocolate.

Now, let’s work on the hot chocolate:

In a large saucepan over medium heat, combine the milk and heavy cream. Stir occasionally until it’s warm but not boiling. You want to avoid scalding.

Add the chopped chocolate to the warm mixture. Stir until the chocolate is melted and fully incorporated.

Next, sprinkle in the brownie mix (about half of the package) and stir until fully blended. It should start to thicken slightly. We’re creating a hot cocoa that’s wonderfully rich!

Add the vanilla extract, sea salt, and ground cinnamon. Taste it! Adjust if necessary—everyone’s palate is different.

Once the brownies have cooled, cut them into squares.

Pour the hot chocolate mixture into mugs, filling them generously.

Top each with a piece of brownie, a drizzle of chocolate sauce, and some mini marshmallows. You might want to snap a picture because it’s a sight to behold!