Step 1

Preheat oven to 400 degrees F.  Spray a 12 count muffin tin with cooking spray or line with paper liners and set aside.

Step 2

In a large bowl, combine the flour, oats, sugar, cinnamon, baking powder, baking soda, and salt.

Step 3

In a separate bowl, whisk together the eggs, milk, applesauce, oil, and vanilla.

Step 4

Make a well in the center of the dry ingredients and add the wet ingredients, stirring just until combined.  Fold in the chopped apple, then divide evenly between the 12 muffin cups.

Step 5

Combine all of the streusel ingredients together in a small bowl, then sprinkle over each muffin.  Bake the muffins for 15 to 20 minutes until a toothpick inserted into the center of the muffins comes out clean.