1Heat oven to 350°F. Spray bottom only of 13x9-inch (3-quart) glass baking dish with cooking spray.
2In large bowl, place cookie mix. Cut in butter, using pastry blender (or pulling 2 table knives through ingredients in opposite directions), until particles are the size of peas. Remove 1 cup crumb mixture to small bowl; stir in walnuts. Set aside for topping. Press remaining crumb mixture into bottom of dish.
3In another large bowl, toss pears, cherries, brown sugar and ginger; spoon over crust. Sprinkle reserved crumb/nut mixture over fruit.
4Bake 40 to 50 minutes or until topping is golden brown and edges are bubbly. Cool about 20 minutes. Serve warm.