Preheat the oven to 350°F. Grease a 9x9-inch baking pan and line it with parchment paper.
Blend the cottage cheese until smooth. Whisk it with the eggs, melted butter and vanilla, then stir in the almond flour, coconut flour, sweetener, baking powder and salt until a thick batter forms.
Spread the batter evenly into the pan.
Stir together the melted butter, brown sugar substitute and cinnamon for the swirl. Drizzle it over the batter in lines, then drag a butter knife or skewer through it in a zigzag pattern to create swirls.
Bake for 30 to 35 minutes, until golden and a toothpick in the center comes out clean. Let it cool for 15 minutes.
Whisk the cream cheese, powdered sweetener, heavy cream and vanilla until smooth and pourable.
Drizzle the glaze over the warm cake so it melts slightly into the swirls. Slice and serve warm or at room temperature.