- 1 (14 ounce) can sweetened condensed milk
- 5 Granny Smith apples – peeled, cored and sliced
- 1 tablespoon all-purpose flour
- 1 1/2 teaspoons ground cinnamon
- 1/2 teaspoon ground nutmeg
- 1 teaspoon vanilla extract
- 1/4 cup water
- Crumble:
- 2 cups rolled oats
- 1 cup all-purpose flour
- 1/2 cup brown sugar
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1/2 cup melted butter
- Place unopened can of sweetened condensed milk in a large pot; fill pot with water to cover. Bring water to a simmer, and simmer can for 3 hours, adding hot water as needed to keep can covered. Remove can from water with tongs; allow to cool, about 20 minutes.
- Place apples in a large bowl. Whisk 1 tablespoon flour, cinnamon, and nutmeg together in a small bowl; stir mixture into apples. Pour apple mixture into a 9×13-inch baking pan. Stir vanilla extract into water in a bowl; sprinkle over apple mixture.
- Open cooled condensed milk carefully. Stir caramelized milk until smooth; drizzle evenly over apple mixture.
- Stir oats, 1 cup flour, brown sugar, baking soda, and salt together until combined; stir in butter until crumbly. Spread crumble mixture over apples and caramel.
- Bake in the preheated oven until apples are tender and crumble is lightly browned, about 25 minutes.