• 1½ cups all-purpose flour
• ¾ cup white sugar
• ½ tsp salt
• 2 tsp baking powder
• ¼ 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
• 1½ tsp ground cinnamon

Preheat the oven to 400º.

Grease 8 muffin cups or line with paper liners.

Combine 1½ cups flour, ¾ 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.

to make crumb topping: Mix together ½ cup sugar, ⅓ cup flour, ¼ cup butter, and 1½ tsp cinnamon. Mix with fork, and sprinkle over muffins before baking.

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