Ingredients:

• 10 tablespoons (140g) unsalted butter, softened
• 1 cup (213g) light brown sugar
• 1/2 teaspoon kosher salt
• 1 large egg
• 1 teaspoon vanilla extract
• 1 3/4 cups (210g) all-purpose flour
• 3/4 teaspoon baking soda
• 1 cup (170g) semi-sweet chocolate chips
• For the chocolate frosting
• 1/2 cup (85g) semi-sweet chocolate chips
• 1/2 cup (113g) unsalted butter, softened
• 1 cup (113g) powdered sugar, sifted
• 1 teaspoon vanilla extract
• Sprinkles, for decorating