"Chocolate, toffee, and coffee. What more could you want in a muffin?..."
INGREDIENTS
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2 cups all-purpose flour
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2/3 cup packed brown sugar
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1/2 cup unsweetened cocoa powder
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1 teaspoon cinnamon
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1 tablespoon instant espresso powder (or dark roast instant coffee)
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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6 tablespoons unsalted butter, melted
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1 1/2 cups buttermilk
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2 large eggs
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1 tablespoon vanilla extract
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1 cup semisweet chocolate chips
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1/4 cup all-purpose flour
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2 tablespoons brown sugar
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1/2 cup toffee bits (such as Heath)
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1 tablespoon butter, room temperature