01 - Preheat the oven to 350°F. Generously grease and flour a Bundt pan, ensuring every crevice is coated to prevent sticking.
02 - In a large mixing bowl, whisk together the all-purpose flour, cocoa powder, baking powder, baking soda, and salt until evenly distributed.
03 - Using a stand mixer or hand mixer, beat the softened butter and granulated sugar on medium-high speed until pale, light, and fluffy, approximately 3 to 4 minutes.
04 - Add the eggs one at a time, beating well after each addition to maintain emulsion. Blend in the vanilla extract until fully incorporated.
05 - With the mixer on low speed, add the dry ingredient mixture alternately with the sour cream and whole milk, starting and ending with the dry ingredients. Mix just until combined; do not overmix.
06 - Pour the batter into the prepared Bundt pan, smoothing the top with a spatula to ensure even distribution.
07 - Bake for 45 to 50 minutes, or until a wooden toothpick inserted into the center of the cake emerges clean.
08 - Allow the cake to cool in the pan for 10 minutes, then carefully invert onto a wire cooling rack. Let cool completely before decorating.
09 - Heat the heavy cream in a small saucepan until just simmering. Pour the hot cream over the chocolate chips and let stand for 2 minutes. Stir gently until a smooth, glossy ganache forms. Allow to cool slightly until it reaches a drizzle-worthy consistency.
10 - Spoon or drizzle the ganache evenly over the completely cooled cake, allowing it to cascade down the sides naturally.
11 - Arrange candied cherries, cranberries, and green candied fruit around the top of the cake to resemble a festive wreath. Tuck fresh rosemary or mint sprigs between the fruit for a greenery effect. Finish with a light dusting of powdered sugar to evoke a snowy holiday finish.