Preheat oven to 350 degrees
Line 12 muffin tins or spray it with cooking spray
IN a large mixing bowl whisk together the flour,sugar, salt , baking powder and cinnamon
Add milk, oil , egg, and vanilla . Mix well
Fold in peeled and diced apples
Fill the 12 muffin wells evenly
In a small bowl combine the brown sugar, granulated sugar, cinnamon, and flour
Slowly add the melted butter and mix well-It will be crumbly
Evenly add the crumb topping on top of the batter
Bake in preheated oven for 35 minutes
Allow to cool for abut 5 minutes and then transfer them to a cooling rack.