Blueberry Muffins

Ingredients
1 1/2 cups flour
3/4 cup sugar
1/2 teaspoon salt
2 teaspoons baking powder
1/3 cup vegetable oil
1 egg
1/3 cup milk
1 cup fresh (or frozen) blueberries

Topping:
1/2 cup sugar
1/3 cup flour
1/4 cup butter, cubed
1 1/2 teaspoons ground cinnamon

Instructions
Preheat oven to 400 degrees. Grease or line muffin cups. Combine flour, 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 dry ingredients. Fold in the blueberries and fill muffin cups. Mix together crumb topping ingredients and sprinkle over muffins before baking. Bake for 20 to 25 minutes or until done.

Source
Heidi Lawson