To Die For Blueberry Muffins

This recipe comes from AllRecipes.com.

To Die For Blueberry Muffins
Ingredients
1½ cups all-purpose flour
¾ cup organic evaporated cane sugar
½ teaspoon salt
2 teaspoons baking powder
⅓ cup vegetable oil
1 egg
⅓ cup milk
1 cup fresh blueberries
½ cup organic evaporated cane sugar
⅓ cup all-purpose flour
¼ cup butter, cubed
1½ teaspoons ground cinnamon

Directions
1. Preheat oven to 400 degrees. Butter muffin cups.
2. Combine 1½ cups flour, ¾ cup organic evaporated can 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.
3. To Make Crumb Topping: Mix together ½ cup organic evaporated cane sugar, ⅓ cup flour, ¼ cup butter, and 1½ teaspoons cinnamon. Mix with fork, and sprinkle over muffins before baking.