Preheat the oven to 350 F. Cube the butter and set in the fridge. You can also use a cheese shredder to shred the butter. Peel and thinly slice the apples.
In a large bowl, add the apples, 1 tablespoon cornstarch, 1/ cup of sugar, 1 teaspoon of lemon zest, and 1 tablespoon of lemon juice. Mix to fully combine. Add the apple mixture to a 9x9 greased pan.
In a medium mixing bowl, add the 1/2 cup of oats, 1/2 cup of flour, 1/2 cup of brown sugar, 1/2 teaspoon cinnamon, 1/2 teaspoon nutmeg, 1/4 teaspoon cloves, 1/4 teaspoon salt, and 1/2 teaspoon vanilla. Mix to combine.
Add the cubed butter to the oat mixture and cut in with a pastry cutter. Pour this mixture on top of the apple mixture, patting it down onto the apples.
Bake the apple crisp for 45 minutes at 350 F. It should be golden and bubbly when done. Let the crisp rest for 10 minutes before digging in. Enjoy served with ice cream and drizzled with caramel sauce. Yum!