Preheat the oven to 325 degrees F. Line one 12-cup and one 6-cup muffin pan with paper or foil cupcake liners.
Make the cupcakes: Sift the cake flour, cocoa powder, baking soda, baking powder and salt together three times. Beat the butter and sugar with an electric mixer at high speed for 15 seconds until combined. Add the eggs, one at a time, beating until each is incorporated. Continue beating until light and fluffy, about 6 more minutes. With the mixer at its lowest speed, beat in one-third of the flour mixture. Beat in the buttermilk and vanilla, then another one-third of the flour mixture. Beat in the coffee and then the remaining flour mixture. Fill the muffin cups halfway and bake for 25 minutes, or until the centers spring back when lightly pressed. Set the pans on a rack to cool.
Make the peanut butter filling: Beat the butter and peanut butter with an electric mixer at medium speed until blended. Reduce the speed to low and gradually beat in the confectioners' sugar. Increase the speed to high and beat for 3 to 5 minutes, until smooth and fluffy. Spoon the filling into a pastry bag fitted with a medium plain tip. Insert the tip into the top of each cooled cupcake and squeeze approximately 1 1/2 tablespoons filling into each cupcake.
Make the ganache frosting: Place the chocolate in a medium bowl. Heat the cream in a small saucepan until scalding. Pour the cream over the chocolate and let sit 1 minute, then whisk until smooth. Let sit 10 minutes, until thick but still pourable. Dunk the tops of the cupcakes into the frosting to coat, then place on a rack and sprinkle with the chopped peanuts. Transfer to the refrigerator for 20 minutes to set.
Photograph by Gentl & Hyers

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	339.43 Kcal (1421 kJ)
Calories from fat	190.86 Kcal
		% Daily Value*
Total Fat	21.21g	33%
Cholesterol	49.81mg	17%
Sodium	208.67mg	9%
Potassium	285.15mg	6%
Total Carbs	34.41g	11%
Sugars	20.98g	84%
Dietary Fiber	2.82g	11%
Protein	7.56g	15%
Vitamin A	0.1mg	2%
Iron	2mg	11%
Calcium	37.3mg	4%

Amount Per 100 g
Calories	382.46 Kcal (1601 kJ)
Calories from fat	215.06 Kcal
		% Daily Value*
Total Fat	23.9g	33%
Cholesterol	56.13mg	17%
Sodium	235.13mg	9%
Potassium	321.3mg	6%
Total Carbs	38.77g	11%
Sugars	23.64g	84%
Dietary Fiber	3.18g	11%
Protein	8.52g	15%
Vitamin A	0.1mg	2%
Iron	2.3mg	11%
Calcium	42mg	4%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

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