Preheat oven to 350 degrees.
In a small bowl, combine the ingredients for the oat topping: 1/4 cup rolled oats, 1 tablespoon granulated sugar, and a pinch of cinnamon. Set aside.
Add the remaining 1 cup of oats to a bowl and add 1/2 cup of milk. Let soak for 5-10 minutes.
In a large bowl, combine egg and brown sugar and whisk until smooth and caramel in color.
Add in vanilla and applesauce, whisking well.
Add flour, oat/milk mixture, baking soda, salt, and cinnamon. Mix.
Add remaining milk and combine until smooth.
Fold in chocolate chips.
Line a muffin tin with liners or spray with non-stick spray. Pour about 1/4 cup batter into each liner.
Sprinkle the tops with the oats/sugar topping.
Bake for 15-18 minutes, or until a toothpick inserted into the middle comes out clean.