1. Preheat an oven to 350⁰F. 2. Combine the flour, rolled oats, brown sugar and cinnamon in a food processor to make the streusel. 3. Mount in the butter and pulse until the mixture becomes crumbly, then refrigerate. 4. In a small bowl, whisk together the Garrison Brothers Bourbon, melted butter, brown sugar, cornstarch and cinnamon. 5. Toss the apples in the Garrison Brothers Bourbon mixture and lay them in a greased baking dish. 6. Top with a thin layer of the crumbled streusel and bake for about 25 minutes, or until the streusel topping has set. 7. Serve with vanilla ice cream.