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1
Preheat oven to 350u00b0. Line 24 muffin cups with paper liners. In a large bowl, combine cake mix, coffee, eggs and oil; beat on low speed 30 seconds. Beat on medium 2 minutes. Fill prepared cups two-thirds full.
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2
Bake 18-22 minutes or until a toothpick inserted in center comes out clean. Cool in pans 10 minutes before removing to wire racks to cool completely.
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3
Meanwhile, in top of a double boiler or a metal bowl over simmering water, melt chocolate with sugar and 3 tablespoons coffee, stirring until sugar is dissolved (mixture will be thick). Whisk in egg yolks; cook and stir 4-5 minutes or until mixture reaches 160u00b0.
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4
Divide mixture among three small bowls. Stir orange juice concentrate into one bowl. Stir Nutella and cream into another; stir remaining coffee into the third bowl. Fold 1/2 cup whipped topping into each. Chill 10 minutes.
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5
Cut a small hole in the tip of a pastry bag or in a corner of a food-safe plastic bag; insert a very small pastry tip. Transfer one filling to bag. With a metal or wooden skewer, poke a hole through bottom of paper liner. Insert tip through hole; pipe filling into eight cupcakes. Repeat with remaining fillings and cupcakes.
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6
For ganache, place chocolates in separate small bowls. In a small saucepan, bring cream just to a boil. Pour 1/2 cup cream over bittersweet chocolate; pour remaining cream over white chocolate. Stir mixtures with a whisk until smooth.
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7
Stir 2 teaspoons corn syrup into bittersweet ganache and 1/2 teaspoon corn syrup into white ganache. Cool bittersweet ganache 10 minutes or until slightly thickened, stirring occasionally. Tint white ganache as desired; refrigerate, covered, until thickened.
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8
Dip tops of cupcakes in bittersweet ganache. Pipe designs using white or tinted ganache. Refrigerate until set. Store in airtight containers in the refrigerator.
