Ingredients
1 cup Filling: water
1 cup sugar
2 tablespoons cornstarch
1 teaspoon cinnamon
2 tablespoons butter
1 teaspoon vanilla
1 1/2 cups Topping: flour
1 cup dark brown sugar
1 1/2 cup old-fashioned oats
1 1/2 teaspoon cinnamon
1/2 teaspoon baking soda
1/2 teaspoon salt
1 1/2 sticks unsalted butter, diced, room temperature
4 cups thinly sliced apples
Preparation
Filling: Combine water, sugar and cornstarch and cook, stirring, over low heat until thick.
Add cinnamon, butter and vanilla. Cool.
Topping: Mix all dry ingredients. Place half in square pan.
Mix cooled sauce with sliced apples. Add to crust. Top with remaining crumble.
Bake 350* for 1 hour.