Preheat oven to 350 degrees. Lightly grease a 9-inch pie plate with butter.
In a small saucepan or skillet, melt the butter until golden brown, about 4-5 minutes. You'll know the butter is browning when the hissing and spitting noises stop and the color deepens...to, you know, a brown color.
Cool the butter slightly, then add to a bowl along with the flour, oats, brown sugar, and cinnamon. Set aside.
In a large bowl, mix the halved berries with the brown sugar, bourbon, cornstarch, and vanilla. Spread into the prepared pie plate. Evenly sprinkle the crumb overtop.
Bake 35-40 minutes until very bubbly, and the crumb topping is golden and crisp. Cool about 10 minutes, then scoop out a big ole portion and top with a heap of vanilla ice cream!
Keyword bourbon, dessert, fourth of july, memorial day, snack, strawberry, strawberry crisp, streusel, summer