· 1 ½ cups all-purpose flour· ¾ cup white sugar· ½ teaspoon salt· 2 teaspoons baking powder· ⅓ cup vegetable oil· 1 egg· ⅓ cup milk, or more as needed· 1 cup fresh blueberries· ½ cup white sugar· ⅓ cup all-purpose flour· ¼ cup butter, cubed· 1 ½ teaspoons ground cinnamon
Step 1Preheat oven to 400 degrees F (200 degrees C). Grease muffin cups or line with muffin liners.Step 2Combine 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 add enough milk to reach the 1-cup mark. Mix this with flour mixture. Fold in blueberries. Fill muffin cups right to the top, and sprinkle with crumb topping mixture.Step 3To 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.Step 4Bake for 20 to 25 minutes in the preheated oven, or until done.