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1
Preheat oven to 325u00b0. Line 24 muffin cups with paper liners.
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2
In a large bowl, beat butter and sugar until crumbly. Add vanilla; beat in eggs, one at a time, mixing well after each addition. In another bowl, whisk together flour, cocoa, baking soda, salt and baking powder; add to creamed mixture alternately with buttermilk and coffee just until blended.
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3
Filled prepared cups half full. Bake until a toothpick inserted in center comes out clean, 15-20 minutes. Cool 10 minutes before removing from pans to wire racks; cool completely.
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4
Using a melon baller, scoop out the center of each cupcake, about 1 inch deep. For filling, beat peanut butter and butter until fluffy. Gradually beat in confectioners' sugar. Pipe or spoon about 1 tablespoon filling into the center of each cupcake.
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5
For ganache, place chocolate in a small bowl. In a small saucepan, bring cream just to a boil. Pour over chocolate; whisk until smooth. Cool until slightly thickened, about 10 minutes. Spoon scant 1 tablespoon ganache over each cupcake, spreading as needed. Sprinkle with peanuts. Refrigerate until set, about 20 minutes. Refrigerate leftovers.
