Irish Coffee Soda Bread

Name: Irish Coffee Soda Bread
Ingredients: 2 cups all-purpose flour, plus more for dusting; 2 cups whole-wheat flour; 1⁄4 cup packed dark brown sugar; 1 1⁄2 tsp. Kosher salt; 1 tsp. baking soda; 4 tbsp. chilled unsalted butter, cut into 1/2-inch cubes; 1 1⁄2 cups buttermilk; 1⁄4 cup Irish whiskey; 3 tbsp. instant espresso powder; 1 large egg, lightly beaten