Spray 10-inch pie plate with non-stick vegetable coating. Arrange pear slices and cranberries in a single layer in bottom of dish. Whisk together remaining ingredients except gingersnaps and powdered sugar. Stir in gingersnaps and pour over fruit. Bake at 350°F for 30 to 40 minutes, or until a toothpick inserted in center comes out clean. Dust with powdered sugar and serve warm.