Topping: mix with a fork and sprinkle over the muffins
1/4cupbutter sliced into small pieces
Preheat the oven to 400 degrees. Combine the oil, sugar, egg, milk, salt, baking powder. Slowly add the flour and fold in the blueberries. Sprinkle the topping on the muffins before baking. Bake for 20-25 minutes or until golden brown.