Get Ready: Preheat your oven to 350°F (175°C) and lightly grease a 9x13 inch baking pan.
Mix the Cake Batter: In a large bowl, combine the almond flour, coconut flour, melted refined coconut oil, sour cream, low-carb sweetener, eggs, vanilla extract, baking powder, and salt. For a super smooth batter, aim to use room temperature ingredients! Stir gently until everything is just combined; don't overmix.
Spread the Base: Carefully spread this thick, delicious batter evenly into your prepared pan.
Whip up the Swirl: In a separate small bowl, whisk together the brown sugar substitute, melted salted butter, almond flour, and ground cinnamon until it forms a lovely, spiced mixture.
Create the Swirl: Pour this cinnamon mixture over the cake batter. Grab a knife and gently swirl it through the batter to create those iconic cinnamon ripples, making sure the filling gets nicely distributed. It's okay if it looks a bit bumpy!
Bake to Perfection: Place the pan in your preheated oven and bake for about 35-40 minutes. You'll know it's ready when the center is set and no longer jiggles. Be sure not to overbake to keep it wonderfully moist.
Prepare the Glaze: While the cake is still warm, combine the softened cream cheese, heavy cream, and low-carb sweetener in a small bowl. Whisk until it's smooth and creamy. (Room temperature cream cheese helps immensely here!)
Drizzle and Enjoy: Generously spread the dreamy cream cheese glaze over the warm cake. Once glazed, slice into generous pieces and savor this easy, healthy, and incredibly satisfying treat!