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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Sift cake mix into a small bowl and set aside.
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3. In a large bowl, combine eggs, oil, buttermilk, sour cream and vanilla extract until smooth.
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4. Stir in cake mix.
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5. Stir in grated zucchini and chocolate chips.
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6. Fill cupcake liners 3/4 full and bake for 17-22 minutes or until an inserted knife comes out clean. (There may be some melted chocolate on the knife from the chocolate chips, but that's okay.)
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7. Chocolate Buttercream: Beat butter for 2 minutes. Add cocoa powder and vanilla extract and beat again. Add milk and 3 cups powdered sugar. Slowly add in more powdered sugar until you reach your desired consistency.
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8. Pipe frosting onto cooled cupcakes and top with chocolate Jimmies.