Amazing Blueberry Muffins

I found this recipe on http://allrecipes.com/

3 c flour
1 1/2 c sugar
1 tsp salt
4 tsp baking powder
2/3 c vegetable oil
2 eggs
2/3 c milk
2 c fresh blueberries or 12 oz frozen blueberries tossed in flour to coat
1/4 c sugar
1/8 c butter, cubed
3/4 tsp cinnamon
2 tbls flour

1. Preheat oven to 350 degrees for frozen berries or 400 degrees for fresh. Line muffin tins.
2. Combine 3 c flour, 1 1/2 c sugar, salt and baking powder.  Place veg oil into a 2 c measuring cup; add eggs and enough milk to fill the cup.  Mix this with the flour mixture.
3. Fold in blueberries.  Fill muffin cups to the top and sprinkle with crumb topping.
4. Crumb Topping: Mix together 1/4 c sugar, 2 tbls flour, 1/8 c butter and 3/4 tsp cinnamon with a fork and/or your fingers.
5.  Bake for 25 minutes or until done.  Let cool completely on wire racks.