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Heat oven to 350. Coat two 6 cup jumbo muffin pans with nonstick cooking spray.
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Whisk together flour, cocoa, allspice, baking powder, baking soda and salt. Set aside.
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Beat butter 2 minutes. Add sugar; beat until fluffy. Add eggs, one at a time, beating well after each. Beat in vanilla. Beat in flour mixture in three additions, alternating with sour cream. Beat 2 minutes more. Fold in chopped chocolate. Fill prepared muffin cups half full.
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Bake at 350 for 25 minutes or until top springs back when touched. Cool cakes for 10 minutes on rack. Turn cakes onto rack; cool completely.
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Make ganache: Bring cream to a boil in a small saucepan. Place chocolate in a medium sized bowl; pour hot cream over top. Stir until smooth.
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Place a rack over a jelly roll pan. Place cakes, flat-side down, on rack. Pour 2 to 3 tablespoons ganache over each cake, smoothing with spatula. Refrigerate one hour or until set, and decorate if desired.