Plantain Walnut Pancakes with Walnut Coconut Yogurt

Name: Plantain Walnut Pancakes with Walnut Coconut Yogurt
Ingredients: 1/2 cup whole-wheat flour; 1/2 cup all-purpose flour; 3 tablespoons packed brown sugar; 1/2 teaspoon double acting baking powder; 1/2 teaspoon baking soda; 1/4 teaspoon salt; 2 eggs, separated, whites at room temperature; 2 tablespoons vegetable oil; 1 very ripe plantain, mashed; 1 1/3 cups buttermilk; 1/2 cup walnuts, toasted and chopped; 1 cup plain or vanilla yogurt, drained in a cloth lined sieve for 2030 minutes; 1/4 cup chopped toasted walnuts; 1/4 cup sweetened flaked coconut; 1 tablespoon maple syrup