INGREDIENTS
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1 1/2 cups all-purpose flour
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1 1/2 cups granulated sugar
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1 cup unsweetened cocoa powder
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1 1/2 teaspoons baking soda
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1 1/2 teaspoons baking powder
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1 teaspoon salt
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2 eggs, at room temperature*
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3/4 cup buttermilk
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1/4 cup plain greek yogurt
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1/2 cup canola oil
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1 tablespoon vanilla extract
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3/4 cup strong brewed coffee, hot
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1/2 cup semi-sweet chocolate chips (optional)
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3 (1 1/2 cups) sticks salted butter, softened to room temperature
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3 cups powdered sugar
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3/4 cup unsweetened cocoa powder
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2 teaspoons vanilla extract
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3-4 tablespoons heavy whipping cream