Gluten-Free Chocolate Cupcakes

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6 tablespoons unsalted butter, cut into pieces

1/2 cup unsweetened Dutch-processed cocoa

1/3 cup freshly brewed coffee

1 cup sugar

1/2 cup brown rice flour

1/4 cup amaranth flour

1/4 cup tapioca flour

1/2 teaspoon gluten-free baking powder

1/2 teaspoon fine salt

1/3 cup sour cream

1 teaspoon pure vanilla extract

2 large eggs, at room temperature