Preheat & prep pan: Preheat oven to 180°C / 350°F. Grease (or line with parchment) skillet or baking pan.
Whisk: coconut and almond flours, baking powder, salt, sweetener together in a bowl.
Whisk the wets: In a bowl, whisk the eggs, melted butter, cream, vinegar and corn extract until well combined.
Fold the wet: ingredients into the dry until just combined; do not overmix. Stir in any optional mix-ins.
Bake: Evenly spread batter into pan. Bake 18–22 minutes or until top is golden and a toothpick inserted in middle comes out clean.
Rest & slice: Cool 10 minutes on a wire rack to set the crumb. Cut into 8 pieces and serve warm.