Preheat oven to 350 degrees F. Line an 8x8 baking dish with parchment paper, or grease it.
Combine all dry ingredients for the crust and crumb in a large mixing bowl.
Combine all wet ingredients for the crust and crumb in a separate mixing bowl.
Add wet ingredients to dry and mix well until a crumbly yet sticky dough like consistency forms.
Use fingers to press 2/3 of the dough to the base of the baking dish into an even crust.
Next, create the filling. Combine all dry ingredients for the filling, and then wet ingredients separately (except for the apple butter!). Combine all ingredients with apple slices and mix well. Apple slices should be coated evenly. Set aside.
Evenly spread apple butter on top of crust in baking dish.
Then, layer apple slices evenly in rows on top of the apple butter.
Finally, take remaining dough and use fingers to crumble it on top. You may also wish to add some granola on top for extra crunch. I love using Purely Elizabeth's grain free vanilla and almond butter granola.
Bake in oven for 30-35 minutes or until bubbling and golden brown on top.
Remove from oven when finished and let cool completely. Cut into squares once cooled.
Before serving, serve at room temperature or warmed up with some vanilla ice cream or gluten free caramel sauce on top. Enjoy!