Preheat oven to 375 degrees. Lightly grease a 9-inch square baking pan.
Pare and core apples. Layer apples and cranberries in pan, sprinkling with sugar as you layer.
Mix flour, brown sugar, and cinnamon. Work in butter with a fork or your fingers until light and crumbly. Sprinkle topping evenly over apples and cranberries.
