Mocha Chocolate Ganache Cupcakes with Pug Cookies

Ingredients

• 1/4 teaspoon salt
• 1/2 cup brown sugar
• 2/3 cup all-purpose flour
• 1/2 teaspoon baking soda
• 1 1/2 cup heavy cream
• 1/2 cup whole milk
• 1/4 cup cocoa powder
• 1 large egg (at room temperature)
• 1/4 teaspoon espresso powder
• 1/4 cup unsalted butter (at room temperature)
• 3 tablespoons sour cream
• 1 cup (175g) coarsely dark chocolate