In a mixing bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and cinnamon.
In another bowl, whisk together the milk, Greek yogurt, egg, vanilla extract, and melted butter until smooth.
Gradually add the wet ingredients to the dry ingredients, stirring until just combined.
Gently fold in the grated apple.
Preheat a griddle or non-stick skillet over medium heat and lightly grease with butter or oil.
Scoop 1/4 cup portions of batter onto the griddle, spreading slightly if needed.
Cook until bubbles form on the surface and the edges start to set, about 2 minutes.
Flip and cook for another 1-2 minutes, or until golden brown.
Repeat with the remaining batter.
Serve warm with maple syrup, cinnamon sugar, or a sprinkle of chopped nuts.