Preheat oven to 375 degrees
Place blueberries in a large bowl and sprinkle with 2 tablespoons of flour and sugar over berries - toss blueberries to coat with flour and sugar.
Place the blueberry mixture in a buttered 8" by 8" baking dish.
For the crisps topping, cream flour, butter, sugar, salt, and baking powder with a pastry blender. Then stir the vanilla extract into the mixture.
Sprinkle the crumbled topping over the blueberry mixture.
Place the baking dish in a preheated oven and bake for 45 to 55 minutes.
The topping will be golden brown when it is ready.
Transfer baked crisp to a wire rack to cool for 30 minutes before serving.