In a food processor, BLEND all crust ingredients until crumbled.
PRESS mixture into bottom and sides of a 9-inch springform pan.
PREHEAT oven to 375 F.
MIX sugar, flour and cinnamon with two cups blueberries; POUR into crust.
BAKE for one hour; REMOVE from oven; SPRINKLE last cup of blueberries over top of tart, PRESSING into the tart while still hot.
Let COOL; dust with powdered sugar.
Use sugar to taste; if blueberries are not sweet, may take up to a cup of sugar.
Per Serving (excluding unknown items): 279 Calories; 12g Fat (37.4% calories from fat); 2g Protein; 42g Carbohydrate; 2g Dietary Fiber; 31mg Cholesterol; 121mg Sodium. Exchanges: 1 Grain(Starch); 1/2 Fruit; 2 1/2 Fat; 1 1/2 Other Carbohydrates.