Preheat oven to 400 degrees F. Grease muffin tin or line with muffin liners.
In a large bowl or a stand mixer, stir vegetable oil, sugar, vanilla, egg and milk. Slowly add in flour, salt and baking powder and stir until combined. If batter is too thick add a little more milk.
Fold in blueberries.
Make crumb topping by; in a small bowl, mix together brown sugar, flour, butter, and cinnamon. Mix with fork and set aside.
Fill muffin cups right to the top, and sprinkle with crumb topping mixture.
Bake for about 25 minutes in preheated oven, or until a toothpick inserted comes out clean.
Place on a cooling rack for about 10 minutes. Enjoy warm or cold!