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 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, mixing thoroughly after each addition. Blend in the vanilla extract until fully incorporated.
05 - With the mixer on low speed, add the dry ingredients alternately with the sour cream and whole milk, beginning and ending with the dry mixture. Mix only until just combined to avoid overworking the batter.
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 comes out clean. The cake should spring back lightly when touched.
08 - Allow the cake to cool in the pan for 10 minutes, then carefully invert onto a wire rack and let cool completely before decorating.
09 - Heat the heavy cream in a small saucepan until just simmering. Pour the hot cream over the semi-sweet chocolate chips and let sit for 2 minutes. Stir gently until a smooth, glossy ganache forms. Allow to cool slightly until it reaches a drizzle-friendly consistency.
10 - Spoon or drizzle the ganache evenly over the completely cooled cake, allowing it to cascade naturally down the sides.
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 into the gaps for a natural greenery effect. Finish with a light dusting of powdered sugar to evoke a snowy holiday finish.