Best Chocolate Birthday Cake
Ingredients:
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1 (18.25 ounce) package devil's food cake mix
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1 (3.9 ounce) package instant chocolate pudding mix
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1 cup sour cream
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¾ cup vegetable oil
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¾ cup water
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4 eggs
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1 cup semisweet chocolate chips
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1 (16 ounce) package prepared chocolate frosting
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2 tablespoons candy-coated milk chocolate pieces (such as M&M's®), or as desired