Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.

In a large bowl, whisk together the flour, baking powder, baking soda, salt, and cocoa powder.

In another bowl, beat the softened butter, granulated sugar, and brown sugar until creamy.

Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.

Gradually add the dry ingredients and buttermilk, alternating between the two, and mix until smooth. Stir in the boiling water until well combined.

Pour the batter evenly into the prepared cake pans and bake in the preheated oven for about 30-35 minutes, or until a toothpick comes out clean when inserted in the center.

In a saucepan, combine sugar, evaporated milk, and butter, and cook over medium heat until the mixture thickens (about 10 minutes). Stir in coconut, pecans, and vanilla extract.

Once the cakes are completely cool, place one layer on a serving platter and spread a generous layer of coconut pecan frosting. Top with the second layer and frost the top and sides.

Slice and serve your delicious Homemade German Chocolate Cake, and prepare for compliments!