Start by gathering your mixing bowl. Combine the all-purpose flour, light brown sugar, granulated sugar, ground cinnamon, ground nutmeg, and salt. This sweet medley will make for the crunchy topping. Next, add in the cold butter pieces, using your fingers or a fork to combine until you achieve a coarse crumbly texture. This is a great way to get a little messy in the kitchen! Finally, stir in the chopped walnuts and rolled oats, bringing extra character to your topping.

Now, let’s get to the good stuff—those apples! In a small bowl, whisk together the granulated sugar, cornstarch, ground ginger, and ground cinnamon. This mixture will perfectly complement the apples that are about to shine. In your crock pot, dump the chopped apples, drizzle with lemon juice, and toss to coat them nicely. Then, sprinkle the cornstarch mixture over the apples and give it a gentle toss again to combine everything.

Once your apples are prepped, sprinkle the topping evenly over them in the crock pot. You want to cover those apples completely with all that deliciousness. Set your crock pot to low and let it do its magic for about 4 hours, or crank it up to high and cook for 2 hours if you’re in a hurry. The kitchen will fill with amazing smells during this time—just be patient!

After the cooking time, turn off the crock pot but leave the lid off. Let your apple dessert stand for about an hour. This allows the topping to firm up nicely. The time will fly!