01 -
Put the butter, cocoa powder, and water or coffee in a medium saucepan over medium-low heat. Stir frequently until the butter melts and everything comes together smoothly. Take it off the heat and let it cool for 10 to 15 minutes.
02 -
Grease a 10 or 12 cup bundt pan really well with butter or cooking spray, making sure to get into all those grooves and corners. Dust it with cocoa powder instead of flour, tap it around to coat evenly, then knock out any excess.
03 -
Turn your oven to 350 degrees and let it preheat.
04 -
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set this aside for later.
05 -
Pour your cooled chocolate mixture into a large mixing bowl or stand mixer bowl. Add the sugar and beat until everything is well combined.
06 -
Beat in the eggs one at a time, making sure each one is fully mixed in before adding the next. Then mix in the vanilla extract, peppermint extract if you're using it, and sour cream.
07 -
Slowly add the flour mixture to your batter, mixing just until you don't see any more dry streaks. Don't overmix or your cake will be tough.
08 -
Gently fold in the chocolate chips, mini marshmallows, and crushed peppermint candies using a spatula.
09 -
Pour the batter into your prepared bundt pan and bake for 50 to 55 minutes. It's done when a toothpick stuck in the center comes out clean or with just a few moist crumbs.
10 -
Let the cake cool in the pan for 5 to 10 minutes. Then flip the pan upside down onto a wire rack. The cake should slide right out on its own after a few minutes. Let it cool completely before adding any toppings.
11 -
Put the chocolate chips in a heat-proof bowl. Heat the heavy cream in a small saucepan over medium-low heat or in the microwave until it's almost simmering. Pour it over the chocolate chips and let it sit for 3 minutes without touching it. Then whisk until it's smooth and shiny.
12 -
Drizzle the ganache all over your cooled cake. While it's still wet, sprinkle on mini marshmallows, crushed candy canes, and mini chocolate chips if you like. Let the ganache set for at least 15 minutes before slicing.