- 1 cup applesauce (such as Mott's® Natural Applesauce)
 - 1 cup white sugar
 - 1 cup packed brown sugar
 - 2 eggs
 - 1 teaspoon vanilla extract
 - 2 1/2 cups all-purpose flour
 - 1 teaspoon baking soda
 - 1 teaspoon salt
 - 1 teaspoon ground cinnamon
 - 1 cup buttermilk
 - 1 cup flaked coconut
 - 1 cup chopped walnuts
 - 1 tablespoon confectioners' sugar, or to taste (optional)
 
- Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13-inch baking dish.
 - Combine applesauce, white sugar, brown sugar, eggs, and vanilla extract together in a bowl. Whisk flour, baking soda, salt, and cinnamon together in a separate bowl. Add flour mixture to the egg mixture, alternating with buttermilk just until batter is moistened. Fold coconut and walnuts into batter; pour into the prepared baking dish.
 - Bake in the preheated oven until a toothpick inserted near the center comes out clean, 45 to 55 minutes. Cool on a wire rack. Dust coffeecake with confectioners' sugar.