10 cups Mcintosh or other tart apples, peeled, cored and sliced
1 cup white sugar
1 tablespoon all-purpose flour
2 teaspoons ground cinnamon
½ cup water
1 cup quick-cooking oats
1 cup all-purpose flour
1 cup packed brown sugar
¼ teaspoon baking powder
¼ teaspoon baking soda
½ cup butter, melted
Butterscotch ice cream for serving
Preheat the oven to 350 degrees F. (175 degrees C.)
Place sliced apples in a 9x13-inch baking dish. Mix white sugar, 1 tbsp of flour, and 1 tsp of cinnamon together; sprinkle over apples. Pour water evenly over apples.
Combine oats, 1 cup flour, brown sugar, 1 tsp cinnamon, baking powder, and baking soda in a large bowl. Add melted butter and mix with a fork until crumbly; sprinkle evenly over apple mixture.
Bake in the preheated oven until top is golden brown and apples are bubbling around the edges, about 45 minutes.
Serve warm with butterscotch ice cream.