Heat oven to 375
Arrange apples in greased square pan 8x8x2 inches. Mix remaining ingredients; sprinkle over apples
Bake until topping is golden brown and apples are tender, about 30 minutes. Serve warm with ice cream.
NOTES: if using sweeter apples cut the brown sugar as your soul desires. If you want more topping add equal parts Flour, Oats, and Butter.