Chocolate Rum Cupcakes

Ingredients

• 1/2 cup unsalted butter, room temperature
• 1/4 cup blackstrap molasses
• 1/4 cup + 2 tablespoons sugar
• 1 ounce dark chocolate
• 1 large egg
• 1 large egg yolk
• 1/2 teaspoon vanilla extract
• 3 tablespoons sour cream
• 1/2 cup all-purpose flour
• 1/4 teaspoon salt
• 1/4 teaspoon baking soda
• 1/4 cup cocoa powder
• 1/4 cup spiced rum
• chocolate mousse frosting (see recipe below)
• gold nonpareils, optional
• 1 1/2 cups heavy whipping cream
• 4 large eggs, room temperature
• 2 tablespoons superfine sugar
• 12 ounces dark chocolate (use the best chocolate you can find)
• 1/4 cup unsalted butter, chopped into small pieces