Blueberry Muffins

1 1/2 cups all-purpose flour
3/4 cup white sugar
1/2 teaspoon salt
2 teaspoons baking powder
1/3 cup vegetable oil
1 egg
1/3 cup milk
1 cup fresh blueberries (I doubled this!)
1/2 cup white sugar
1/3 cup all-purpose flour
1/4 cup butter, cubed
1 1/2 teaspoons ground cinnamon 

Preheat oven to 400 degrees F. Grease muffin cups or line with muffin liners. 

Combine 1 1/2 cups flour, 3/4 cup sugar, salt and baking powder. Place vegetable oil into a 1 cup measuring cup; add the egg and enough milk to fill the cup. 

Mix this with flour mixture. Fold in blueberries. F

ill muffin cups right to the top, and sprinkle with crumb topping mixture. 

To Make Crumb Topping: Mix together 1/2 cup sugar, 1/3 cup flour, 1/4 cup butter, and 1 1/2 teaspoons cinnamon. Mix with fork, and sprinkle over muffins before baking. 

Bake for 20 to 25 minutes in the preheated oven, or until done.