Oat and Apple Pancakes

Name: Oat and Apple Pancakes
Ingredients: 1 cup whole wheat flour; ¾ cup old-fashioned oats; ¼ cup finely chopped pecans or almonds; 1 teaspoon baking powder; 1 teaspoon baking soda; ½ teaspoon ground cinnamon; ½ teaspoon kosher salt; 1 large egg; 1¾ cups buttermilk; 2 tablespoons pure maple syrup, plus more for serving; 2 tablespoons virgin coconut oil, melted, slightly cooled, plus more for skillet; 1 medium apple (such as Granny Smith or Pink Lady), peeled, cored, sliced crosswise ¼ inch thick; Plain yogurt (for serving)