Preheat a skillet to medium-high heat (275 degrees).

Whisk together the milk and vinegar and allow to rest for 5 minutes.

While milk is curdling, whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl.

Whisk egg and oil into milk. Add wet ingredients to dry ingredients and stir until combined (don’t over-mix, it should still have some lumps).

Spray skillet with cooking spray. Use a 1/4 cup measuring cup to pour batter onto skillet. Cook about 2 minutes until bubbles form and the edges start to look 'dry'. Use a spatula to flip the pancake and cook another 1-2 minutes on the other side. Set pancakes aside and repeat with remaining batter.

Add butter, apples, brown sugar, and cinnamon to a medium saucepan. Stir over medium heat 3-5 minutes until apples are very tender. Stir in syrup. Serve apple topping over warm pancakes.