Step 1: In a large mixing bowl, whisk together the flour, sugar, baking powder, cinnamon, and salt until well combined.
Step 2: In a separate medium bowl, beat the egg, then stir in the buttermilk, melted butter, and vanilla extract.
Step 3: Pour the wet ingredients into the dry ingredients and stir gently with a spatula until just combined. Do not over-mix.
Step 4: Gently fold in the grated apple until distributed throughout the batter.
Step 5: Heat a non-stick griddle or large skillet over medium-low heat and lightly grease with butter or oil.
Step 6: Scoop 1/4 cup of batter per pancake onto the hot surface. Cook until bubbles appear on top and edges are set, about 2-3 minutes.
Step 7: Flip and cook for another 1-2 minutes until golden brown on both sides. Serve warm with maple syrup.