My best blueberry muffins

1 1/2 cups flour
3/4 cup sugar
1/2 teaspoon salt
2 teaspoons baking powder
1/3 cup veggie oil
1 egg
1/3 cup milk
1 cup fresh blueberries

Crumb topping:
1/2 cup brown sugar
1/3 cup flour
1/4 cup butter
1 1/2 teaspoon cinnamon

Preheat oven to 400 degrees.
Grease muffin cups.
Combine flour, sugar, salt and baking powder. Add oil, egg and milk. Fold in blueberries. Fill cups to the top; sprinkle with crumb topping.
Bake 20-25 minutes.