Name: Classic Chocolate Birthday Cake Recipe
Prep time: prep time: 30 minutes
Cook time: bake time: 25-35 minutes
Total time: total time: 2 hours, including cooling and frosting
Yield: makes 1 4×4 inch cake*
Ingredients: 3 tablespoons unsalted butter, at room temperature; 6 tablespoons firmly packed dark brown sugar; 1 tablespoon granulated sugar; 1/2 large egg (1 1/2 tablespoons); 1/2 large egg yolk (1/2 tablespoon); 6 tablespoons buttermilk; 1/2 teaspoon vanilla; 1/4 cup cocoa powder; 1/2 cup all-purpose flour; 1/8 teaspoon baking soda; 1/4 teaspoon baking powder; 1/4 teaspoon table or fine sea salt; 1/4 cup unsalted butter, at room temperature; 3/4 cup powdered sugar; 1 ounce unsweetened chocolate, melted and cooled; pinch of fine sea salt; 1/2 tablespoon milk; 1/4 teaspoon vanilla extract