Preheat your oven to 350F. Spray an 7 1/2 x 11 1/2 brownie pan with cooking spray (you could substitute a 9x9 square pan, but the cooking time will be slightly longer and the cake will be taller)
In a medium bowl, whisk the cocoa, flour, baking powder, and salt; set aside.
In a mixing bowl, cream butter and sugar until light and fluffy. Beat in eggs, one at a time, then beat in vanilla. Reduce speed to low. Add flour mixture alternating with sour cream, starting and ending with the flour mixture.
Spread batter into prepared pan. Tap pan firmly on counter top several times to force out large air bubbles. Bake until a toothpick inserted in center comes out clean, about 25 minutes. Don't over bake!
for the frosting
Heat the cream in a microwave safe bowl in the microwave until it just starts to simmer. Add in the chocolate and let sit for a couple of minutes. Then stir until smooth and glossy and the chocolate is all melted. If the chocolate isn't completely melted and smooth, zap it for another 15-30 seconds in the microwave.
Add the sugar and cocoa powder and whisk until completely smooth. Pour over the cooled cake. Put the cake in the refrigerator to chill and set the frosting. I like to leave it there for a couple of hours, or overnight. Serve cold, and store in the fridge.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
Did You Make This?We love seeing what you've made! Tag us on social media at @theviewfromgreatisland for a chance to be featured.