1/4 cup (52 grams) brown sugar, packed, light or dark
1/4 cup (57 grams) buttermilk
1 teaspoon vanilla
1 1/2 cups (170 grams) confectioners’ sugar
Instructions
Oven and Pan Prep: Preheat the oven to 350 F. Grease and flour a 13-by-9-inch baking pan or spray it with baking spray.
Chocolate Mixture: Combine the butter, water, and cocoa in a saucepan and heat over medium-low heat until the butter is melted.
Cake Batter: In a mixing bowl with an electric mixer on low, combine the buttermilk, eggs, soda, salt, and vanilla. Beat until smooth and well blended. Slowly beat in the butter and cocoa mixture. Add the sugar and flour and beat until blended. Spread the batter in the prepared baking pan.
Bake: Bake the cake for 25 minutes, or until the cake springs back when gently pressed with a finger. Let the cake cool for 15 minutes, then poke holes evenly over the cake.
Make the Glaze: Just before the cake is done cooling, combine the butter and cocoa in a saucepan and heat over medium-low heat until the butter is melted. Remove the pan from the heat and stir in the brown sugar, buttermilk, and vanilla; stir until smooth. Pour the glaze over the top of the warm cake, spreading it to cover, letting it sink into the holes.
Serve: Cool for at least 25 to 30 minutes, then cut the cake into squares and serve with ice cream or whipped cream. Enjoy!