For the crumble, combine the oats, flour, brown sugar, baking powder, and baking soda. Add butter and cut into mixture with pastry cutter or fork until it resembles coarse crumbs. Set aside while you prepare the apples.
In a large bowl mix the Truvia brown sugar blend, 1 teaspoon flour, ground cinnamon, and nutmeg together. Add the apples and 1/2 cup of the crumble topping and toss to combine.
Pour the apple mixture into a greased 9” skillet pan or 9” square pan. Top with the remaining crumble mixture.
Bake for about 40 minutes or until the top is golden brown and the filling is bubbling.
Notes
To make this recipe using regular brown sugar, use 1/2 cup light brown sugar in the apple mixture and 1 cup brown sugar in the crumble topping.