01 -
In a medium saucepan over medium-low heat, melt the cubed butter with unsweetened cocoa powder and water or coffee, stirring frequently until smooth. Remove from heat and cool for 10 to 15 minutes.
02 -
Grease a 10-12 cup bundt pan thoroughly with butter or nonstick spray, then dust with cocoa powder. Tap out excess cocoa powder to prevent sticking.
03 -
Preheat the oven to 350°F (177°C).
04 -
In a medium bowl, whisk together all-purpose flour, baking powder, baking soda, and sea salt until evenly distributed.
05 -
Transfer the cooled chocolate mixture to a large mixing bowl or stand mixer. Add granulated sugar and beat to combine. Add eggs one at a time, mixing thoroughly after each addition. Blend in vanilla extract, peppermint extract if using, and sour cream until just combined.
06 -
Gradually add the dry flour mixture to the wet batter, mixing gently until no streaks remain to preserve a tender crumb.
07 -
Gently fold in semi-sweet chocolate chips, crushed peppermint candies, and mini marshmallows to maintain their texture and distribution within the batter.
08 -
Pour the batter evenly into the prepared bundt pan. Bake at 350°F (177°C) for 50 to 55 minutes, or until a toothpick inserted in the center comes out clean or with moist crumbs.
09 -
Allow the cake to cool in the pan for 5 to 10 minutes to release steam, then invert onto a wire cooling rack. Let cool completely before adding the ganache and toppings.
10 -
Place semi-sweet chocolate chips in a heatproof bowl. Heat heavy cream just below simmering and pour over the chips. Let sit for 3 minutes, then whisk until smooth, glossy, and silky.
11 -
Drizzle the ganache over the cooled cake. Decorate generously with mini marshmallows, crushed candy canes, and mini chocolate chips. Allow the ganache to set for at least 15 minutes before serving.