Combine the flour, oats, sugar, baking powder, baking soda, cinnamon, and salt in a large bowl. Whisk them together.
In a medium bowl add the eggs, buttermilk, applesauce, and vanilla and whisk them together.
Add the wet ingredients to the dry ingredients and whisk them together until just combined. The batter may still be slightly lumpy, don't overmix it.
Heat a frying pan over medium low heat, and spread the pan all over with butter or nonstick spray.
Pour pancake batter into the pan in using a 1/4 cup measuring cup.
Cook the pancake for about 1 minute or until the batter starts to bubble on top and the bottom of the pancake is golden brown.
Flip the pancakes and cook until the bottom side is fully cooked.
Repeat with remaining batter.
Top pancakes with butter, syrup, and chopped up apples if desired.