Preheat oven to 400 degrees f. Peel an core pears; cut into lrg chunks. In a very lrg bowl, stir together 1/4 of the cup of granulated sugar and the cornstarch. Add pears,blueberries,stirring to combine.Transfer to a 3-quart baking dish.
in a lrg bowl, combine flour an half the cup of granulated sugar and the brown sugar. using a pastry blender, cut in butter until mixture is crumbly. sprinkle over fruit.
Bake for 30 min or until top is lightly browned and syrup is bubbly let cool for 40 min before you serve then ummmmmmmmmmm