Preheat the Oven: Start by preheating your oven to 350°F (175°C). Prepare a bread pan by greasing and flouring it to ensure easy release after baking.
Cream Butter and Sugar: In a large mixing bowl, cream together the softened butter and granulated sugar until the mixture is light and fluffy. This typically takes about 3-4 minutes with a hand mixer.
Add Eggs: Add eggs one at a time, ensuring you mix well after each addition. This helps to incorporate more air and makes your cake lighter.
Mix Dry Ingredients: In a separate bowl, sift together the all-purpose flour, baking powder, baking soda, and salt.
Combine Mixtures: Gradually add the dry ingredients into the butter mixture, alternating with the buttermilk. Start and finish with the dry ingredients, mixing well to ensure no lumps remain.
Add Vanilla and Fold in Mix-ins: Stir in the vanilla extract, then gently fold in the shredded coconut, chopped walnuts, and half of the chocolate chips into the batter.
Pour and Bake: Pour the batter into the prepared bread pan and bake for 55-60 minutes. To check if it's done, insert a toothpick into the center; it should come out clean.
Cool the Cake: Allow the cake to cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
Prepare Ganache: In a small saucepan, heat the heavy cream over medium heat until it begins to simmer. Remove from heat, add the remaining chocolate chips, and stir until smooth.
Drizzle and Serve: Drizzle the chocolate ganache over the cooled cake. Optionally, sprinkle additional chopped walnuts and coconut on top for a delightful presentation.