Heat oven to 350°F. Spray 8-inch square (2-quart) glass baking dish with cooking spray. In large bowl, mix pears, cranberries, granulated sugar and 3 tablespoons flour. Spoon evenly into baking dish.
In medium bowl, mix crushed granola bars, 1/2 cup flour, the brown sugar and butter until crumbly. Sprinkle over pear mixture.
Bake 55 to 65 minutes or until top is golden brown and fruit is tender (mixture will be bubbly). Cool slightly. Serve warm or cool with whipped cream or ice cream.