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Preheat & Prepare:
Preheat your oven to 350°F (175°C). Grease and line a rectangular baking pan (about 9×13 inches or 23×33 cm) with parchment paper.
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Make the Cake Batter:
In a large mixing bowl, whisk together the melted butter and granulated sugar until smooth. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract and milk.
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Combine Dry Ingredients:
In a separate bowl, sift together the cocoa powder, flour, baking powder, and salt. Gradually fold the dry ingredients into the wet mixture until you have a smooth batter.
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Bake:
Pour the batter into the prepared baking pan and smooth the top with a spatula. Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool completely in the pan.
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Prepare the Mocha Icing:
In a medium bowl, beat the softened butter until creamy. Add the powdered sugar, cocoa powder, brewed coffee, and vanilla extract. Beat until smooth and fluffy.
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Frost & Top:
Spread the mocha icing evenly over the cooled cake. Sprinkle the shredded coconut generously over the top.
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Serve & Enjoy:
Cut the cake into squares and serve. This treat pairs perfectly with a cup of coffee or tea!