FOR THE CHOCOLATE CUPCAKES: – 1 cup (125 grams) all-purpose flour (spooned & leveled) – ¼ cup plus 2 tablespoons (30 grams) unsweetened cocoa powder – ¾ teaspoon baking powder – ½ teaspoon baking soda – ½ teaspoon salt – ½ cup (100 grams) brown sugar – ½ cup (100 grams) granulated sugar – ⅓ cup (80 ml) oil – ½ cup (120 ml) buttermilk – 1 large egg – 1 teaspoon vanilla extract – ½ cup (120 ml) boiling water – 1 teaspoon instant espresso powder (optional) FOR THE PEANUT BUTTER FROSTING: – 1/2 cup (115 grams) unsalted butter , softened – 1 cup (250 grams) creamy peanut butter – 2 cups (240 grams) powdered sugar – 3 tablespoons (45 ml) heavy whipping cream – 1 teaspoon vanilla extract
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