Preheat your oven to 325 degrees F. Grease a silicone 9 inch bundt pan and place on a small baking sheet pan. Set aside.
Place chopped apples and cinnamon together in a small bowl and stir to coat the apples. Set aside.
Whisk together the coconut flour, brown sugar sub, baking soda and powder, apple pie spice, salt and glucomannan and add to a stand mixer or large bowl.
Pour the sour cream, butter and heavy cream into the dry ingredients in the stand mixer or bowl. Blend until combined. Mix in the apple extract and stevia.
Add one egg at a time into the batter until combined.
Take half of the apples and spread them all around the bottom of the bundt pan. Spread half of the batter over the apples in the bundt pan. Spread the remaining apples over the batter and then the remaining batter over the apples.
Place the pan in the middle of the oven and bake for 50-60 minutes or until a toothpick in the center comes out clean. Allow to cool. Once cooled, place your serving plate over the top of the bundt pan and flip cake over. It should easily release from the silicone pan. Slice into 16 servings and enjoy with my sugar free caramel sauce or my keto butter pecan ice cream.