Step 1: Prep Your Oven and Pan: Preheat your oven to 325°F (163°C). Grease and flour your Bundt pan or 10-inch tube pan thoroughly, ensuring every nook and cranny is coated.
Step 2: Cream the Wet Ingredients: In a large mixing bowl, beat softened butter, granulated sugar, and brown sugar until light, fluffy, and pale (a few minutes). Beat in eggs one at a time until fully incorporated. Stir in sour cream and vanilla extract until beautifully combined.
Step 3: Combine Dry Ingredients: In a separate bowl, whisk together all-purpose flour, baking powder, baking soda, salt, and 1 tablespoon of ground cinnamon until evenly distributed.
Step 4: Marry Wet and Dry: Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk. Start and end with dry ingredients. Mix just until combined; do not overmix.
Step 5: Assemble the Swirl: In a small bowl, quickly mix together the brown sugar and cinnamon for your swirl.
Step 6: Layer and Swirl: Pour about half of the cake batter into your prepared pan. Sprinkle the brown sugar-cinnamon swirl mixture evenly over this layer. Gently pour the remaining batter on top. Take a knife and gently swirl it through the batter to create marbling patterns, being careful not to overdo it.
Step 7: Bake to Perfection: Bake in the preheated oven for 65–75 minutes. The cake is ready when a toothpick inserted into the center comes out clean or with a few moist crumbs.
Step 8: Cool and Glaze: Let the cake cool in the pan for about 15 minutes. Carefully invert it onto a wire rack to cool completely. Ensure the cake is completely cool before glazing to prevent the glaze from melting.
Step 9: Whip Up the Glaze: Once the cake is cool, whisk together the powdered sugar, milk (2-3 tbsp for desired consistency), vanilla extract, and the optional honey until you have a smooth, pourable glaze. Adjust milk or powdered sugar as needed.
Step 10: Drizzle and Serve: Drizzle the glaze all over your cooled Honey Bun Pound Cake. Let it set for a few minutes, then slice and enjoy.