Preheat the oven to 350F and spray a 9x5 Loaf Pan with cooking spray - set aside.
Peel (optional), and cut your apples into evenly thin slices, about ¼ inch thick.
In a large bowl, toss your apples with cinnamon, nutmeg, salt, water, freshly squeezed lemon juice, and the vanilla extract until everything is evenly covered. Set aside.
In a small bowl for the crumble topping, first cut the cold butter into smaller cubes - this makes it easier to break it up. Combine the flour, brown sugar and butter, using your fingers or a fork, break up the butter and combine until evenly distributed - it should be a soft crumble texture.
Add your apple mixture to your loaf pan. Top with the crumble topping. Pile it high, as the apples cook, they will settle down.
Place loaf pan on a baking sheet (for easier carrying and for it to be steady and level on the oven rack. Place in your preheated oven for 40 minutes, until your apples are fork tender. Instead of putting an actual fork through the apple crisp I suggest a tooth pick. If the apple seems soft enough (the tooth pick easily goes through) then it’s done!Take it out and let it cool down.