Suroviny
1 (1/4-ounce) package active dry yeast
1/2 cup warm water (105 to 110 degrees)
2 cups buttermilk
3 tablespoons peanut oil
2 tablespoons sugar
2 cups whole-wheat pastry flour
1/2 cup rolled oats
4 large egg whites
1/8 teaspoon baking soda
1/4 teaspoon fine salt
Cooking spray for waffle iron
Maple syrup, for serving