Mocha Chip Cupcakes

Ingredients

• ½ tsp. baking soda
• 1-½ tsp. pure vanilla extract
• 2 tsp. instant espresso powder, dissolved in ½ cup cool water
• 4 oz. (½ cup) unsalted butter, at room temperature
• ¼ tsp. table salt
• 1 recipe Chocolate–Sour Cream Frosting
• 1 cup granulated sugar
• + 4 more ingredients
• • 4-½ oz. (1 cup) unbleached all-purpose flour
  • 4 oz. (²/₃ cup) semisweet chocolate chips
  • 3 oz. unsweetened chocolate, chopped
  • 2 large eggs

Position a rack in the lower third of the oven and heat the oven to 350°F. Line 12 standard-size muffin cups with paper liners. Put the unsweetened chocolate in the top of a double boiler or in a metal bowl set over a small saucepan of barely simmering water. Stir occasionally until the chocolat...

View full recipe at Fine Cooking