Preheat your oven to 400ยบ and line a 6 well muffin tin with paper liners.
In a mixing bowl whisk together the egg, milk, apple sauce and vanilla.
In a separate bowl combine the brown sugar, flour, baking soda, cinnamon and salt.
Stir the wet ingredients into the dry until just moistened.
In a small bowl combine all of the topping ingredients and mix until a sand-like texture is achived. Spoon the batter into the paper liners and top generously with the crumb topping.
Bake for 15-18 minutes until a tester comes out with just a few crumbs on it.
Cool in the pan 5 minutes and serve warm.
Notes
Recipe adapted from muffins in Better Homes & Gardens: Complete Step-By-Step Cook Book
Coursesbreakfast, muffin
Recipe by It Bakes Me Happy at https://itbakesmehappy.com/2013/08/cinnamon-crumb-muffins.html