Preheat oven to 350°F. Spray the cups of a 12 cup muffin pan with cooking spray.
In a medium size mixing bowl, whisk together milk, apple sauce, maple syrup, vanilla and eggs until fully blended.
Add oatmeal, brown sugar, 1 cup apples, pecans, apple pie spice, baking powder and salt. Mix well, until apples and pecans are evenly distributed.
Use a ¼ cup measuring cup or a 4 ounce ice cream scoop to divide mixture evenly between muffin cups. Divide remaining apples between muffin cups pressing into mixture. Sprinkle tops with turbinado sugar.
Bake for 25-30 minutes until lightly puffed and golden.
Serve immediately with additional maple syrup.