Preheat the oven to 375F. Grease a 9 inch spring form pan and a large sheet pan or baking dish.
Chop the apples up into bite sized pieces and add them to a bowl. No need to peel. Sprinkle the sugars, nutmeg, cinnamon, salt, and flour over the apples and mix. Using your hands will be easiest here. Then add the lemon juice and vanilla extract. Add the apple mixture to the baking dish and bake for about 1 hour, stirring the apples every 15-20 minutes. Take the apples out when they are soft and easy to poke through. You don’t want them toasty or burnt.
While the apples are cooking, pulse the graham crackers in a food processor until broken up. Add the melted butter, teaspoon brown sugar, and teaspoon of salt and pulse until fully combined. If you don’t have access to a processor, you can crush the graham crackers in a ziplock back and add the crumbs and other ingredients to a bowl. When the ingredients are mixed up, add to a 9 inch pie or tart pan. Lower the oven to 350F and bake for about 5 minutes and let cool.
To make the whipped cream, add the heavy whipping cream and powdered sugar to a stand mixer and mix on low for about 2-3 minutes, then high for about 5. You can also use a handheld mixer for this. Add the bourbon and vanilla and mix for an additional minute or so.
To assemble, pour the dulce de leche from the can or baking dish onto the crust. You will need to smooth it out if pouring from a can. Add the apples on top of the dulce, then top with whipped cream if using. I like to sprinkle a tad of cinnamon at the top for a finished look. Hope you enjoy!