Best Blueberry Muffins!

These muffins are so great!  The key is fresh blueberries!  Frozen and thawed blueberries will make these muffins sink.

1 1/2 cup, all purpose flour
3/4 cup white sugar
1/2 tsp salt
2 tsp baking powder
1/3 cup vegetable oil
1 egg
1/3 cup buttermilk
1 cup FRESH blueberries

1/2 cup brown sugar
1/3 cup all-purpose flour
1/4 cup cold butter, cubed
1 1/2 tsp ground cinnamon

1. Preheat oven to 400 degrees F (200 degrees C). Grease muffin cups or line with muffin liners.
2. Combine 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 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 1/2 cup brown sugar, 1/3 cup flour, 1/4 cup butter, and 1 1/2 teaspoons cinnamon. Mix with fork, and sprinkle over muffins before baking.
4. Bake for 20 to 25 minutes in the preheated oven, or until done.

I have made these without the crumb topping and they are still very delicious!!!