For the Crust and Topping
- 1 1/2 cups gluten-free rolled oats
- 1 cup almond flour
- 2/3 cup dark brown sugar
- 1/2 cup butter, diced
For the Apple Filling
- 3 1/2 cups thinly sliced apples (roughly 3–4 small to medium pink lady or Granny Smith apples)
- 1/4 cup maple syrup
- 1 teaspoon cinnamon
- 1/2 teaspoon ground cardamom
- 1/2 tablespoon vanilla extract
- juice of one lemon
- 2 teaspoons arrowroot or cornstarch
Icing Drizzle:
- 1/4 cup powdered sugar
- 1 tablespoon almond milk