Using steel blade, place flour, baking powder, oats and 1/2 cup sugar in food processor bowl; pulse. Add margarine; pulse until mixture is the size of small peas. Remove 1 cup of crumb mixture and reserve for topping. Spray bottom of a 2 quart rectangular glass dish with non stick vegetable spray. Pat remaining crumb mixture into prepared dish. Rotating midway through cooking, microwave on high 4 to 5 minutes. Set aside. Put cranberries, remaining 1/4 cup sugar, cornstarch, allspice and cinnamon into a 4 cup glass measure; stir. Cover with plastic wrap, venting spout area. Stirring midway through cooking, microwave on high 5 minutes. Process in food processor. Spread cranberry mixture over warm crust. Sprinkle reserved crumb mixture over top. Rotating dish midway through cooking microwave on high 3 to 4 minutes. Cool completely before cutting.