INGREDIENTS
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1/3 cup cocoa powder
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1/2 tsp baking soda
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1/2 cup boiling water
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1/4 cup butter, melted
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2 1/2 Tbsp vegetable or canola oil
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3/4 cup + 2 Tbsp granulated sugar
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3/4 tsp vanilla extract
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1/4 tsp salt
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1 large egg
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1 large egg yolk
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1/4 cup heavy cream
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3/4 cup + 2 Tbsp all-purpose flour
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3/4 cup butter, partially softened** (preferably half salted and half unsalted butter)
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1 tsp mint extract (don't use peppermint!)
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1/2 tsp vanilla extract
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2 1/4 cups powdered sugar
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1 Tbsp heavy cream
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Green food coloring (I used 10 drops)
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85g semi-sweet or bittersweet chocolate, finely chopped (1/2 cup)