1. Preheat oven to 375°.
2. Combine apples and apple butter; arrange in 8-inch square baking dish coated with cooking spray, pressing down lightly to compact.
3. Combine flour, oats, sugar, cinnamon, and salt in a medium bowl; cut in butter using a pastry blender or 2 knives until mixture resembles coarse meal. Stir in pecans. Sprinkle mixture over apples. Bake at 375° for 45 minutes or until bubbly and golden brown.