Preheat the oven to 350F and spray a regular sized muffin tin with some nonstick cooking spray.
In a bowl, whisk together the egg, egg whites and sugar. You can remove the cream centers from the Oreo cookies and add the cream into the mix. Mix it well to blend up the cream centers. Set the Oreo cookie wafers aside for now.
Stir in the apple sauce, milk, and vanilla, and mix well.
Add in the flour, cocoa powder, baking powder and soda and stir.
Fold in the mini chocolate chips then fill the muffin cups with the batter.
Use a small zip lock bag to crush the Oreo wafers into crumbs. Sprinkle the crumbs over the tops of the muffins.
Bake in the oven for 20 minutes, let cool, and serve. Enjoy!