Bread, Breakfast, Snack
Preheat oven to 400 degrees F (200 degrees C).
Grease 12 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.
Fill muffin cups right to the top, and sprinkle with crumb topping mixture.
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.
20 to 25 minutes in the preheated oven, or until done.