Step 1

Preheat your oven to 350°.

Step 2

Mix butter, oats, brown sugar, flour, cinnamon and salt in a medium bowl. Spread half the oat mixture into the bottom of a greased 9x13 pan.

Step 3

In a small saucepan cook the sugar, cornstarch, water and vanilla over medium-high heat for 4-5 minutes or until thick.

Step 4

Top the oat mixture with the sliced apples and pour the cornstarch mixture over the apples.

Step 5

Sprinkle the remaining crumb mixture on top.

Step 6

Bake at 350° for 1 hour. Let rest 1 hour before serving.