Directions

1. In a medium-size bowl, place the flour, xanthan gum, salt, granulated sugar and brown sugar. Whisk to combine well, working out any lumps in the brown sugar. Add the oats, and mix to combine. Create a well in the center of the dry ingredients and add the melted and cooled butter. Mix to combine. The mixture should come together and be thick. Place in the refrigerator to chill while you make the cake batter.
2. Preheat your oven to 350°F. Line a rimmed baking sheet with parchment paper. Grease well a 9-inch round baking pan with at least 2-inch high sides and set it on top of the lined baking sheet.
3. First cook the prepared apples. In a medium-size, heavy bottom saucepan, place the apple wedges, ground cinnamon and brown sugar, and toss to coat the apples in the cinnamon and sugar. Add 2 tablespoons of water, and mix to combine. Place the saucepan over medium-high heat and cook, stirring occasionally, until the apple slices are fork-tender (about 5 minutes), adding more water if necessary to prevent the mixture from burning. You don’t want to cook the apples down into sauce. Remove from the heat and set aside to cool briefly.