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| unsweetened cocoa powder (sifted): 1 cup |
| water: 1 cup (boiling) |
| salted butter: 1 cup (softened) |
| granulated sugar: 2 1/2 cups |
| eggs: 4 |
| vanilla extract: 2 tsp |
| cake flour: 3 cups |
| baking soda: 2 tsp |
| baking powder: 1/2 tsp |
| salt: 1/2 tsp |
| sour cream: 1 cup |
| semisweet chocolate chips (chips): 2 cups |
| salted butter: 1/2 cup |
| sour cream: 1 cup |
| vanilla extract: 1 tsp |
| powdered sugar (unsifted): 5 cups |
Credit: Food.com