Preheat oven to 400 and prep a 12-count muffin pan by generously greasing the cups with nonstick cooking spray or filling them with paper liners.
In a large mixing bowl, combine flour, sugar, baking powder and salt.
Stir in egg, milk, vanilla extract and oil until combined.
Fold in chocolate chips.
Evenly distribute muffin batter among the muffins cups in the prepared pan. An ice cream scoop can be helpful for portioning.
In a small bowl, combine the crumb topping ingredients together. Crumble with your fingers.
Top muffins with the crumb mixture.
Bake 15-18 minutes or until a toothpick inserted into the center of the middle muffin comes out clean.
Cool completely in the muffin pans sitting on a wire rack.