Ceylon Cinnamon Swirled Coffee Cake

Ingredients

• 1 cup packed light brown sugar
• 1/2 cup granulated sugar
• 2 cups all purpose flour
• 1/2 teaspoon ground nutmeg
• 2/3 cup plus 2 tablespoons melted butter
• 1/2 cup chopped walnuts
• 1 teaspoon ground Ceylon cinnamon
• 1 large egg, beaten
• 1 cup buttermilk
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 2 1/2 tablespoons packed light brown sugar
• 2 1/2 tablespoons granulated sugar
• 1 teaspoon Dutch process cocoa powder