Ingredients
Topping:
¾ cup all-purpose flour
¼ cup rolled oats
½ cup brown sugar
¼ teaspoon ground nutmeg     
¼ teaspoon salt
6 tablespoons chilled butter, cut into small pieces

Fruit:
3 lbs apples, peeled and thinly sliced
1 tablespoon lemon juice
1 teaspoon ground cinnamon

Steps

1. Preheat oven to 375 degrees. Lightly butter a 2 quart baking dish.
2. Toss together apples, lemon juice and cinnamon. Place fruit mix in baking dish.
3. Mix together the dry topping ingredients in a large bowl. Add butter pieces and work in with your fingers or a pastry blender. Mix until the topping has a crumbly texture. Distribute topping evenly on fruit.
4. Bake for 50-60 minutes until the topping is brown and fruit is bubbling.  

 Variation: Substitute pears for apples. Pears cook more quickly so check for doneness at 45 minutes.