Muffins
3 C. all-purpose flour
1 1/2 C. granulated sugar
1 tsp. salt
4 tsp. baking powder
2/3 cup vegtable oil (or canola)
2 tsp. vanilla
2 large eggs
about 2/3 C. milk
2heaping cups of fresh blueberries (or frozen, do not thaw)

Crumble Topping
1 C. packed brown sugar
2/3 C. all-purpose flour
1/2 C. (1 stick) unsalted butter, cold and cubed
4 tsp. ground cinnamon

This ingredient list yields about 24 muffins when using a regular 12-cup muffin pan.  You can cut this recipe in half if you only want to make one batch of 12 muffins.