Preheat your oven to 325 degrees Fahrenheit.
In a medium bowl, whisk together the low carb baking mix, stevia/erythritol sweetener blend, baking powder, cinnamon, and banana powder (if using).
In a separate bowl, mash the ripe banana with a fork until smooth. Then, add in the eggs, melted butter, heavy cream, and vanilla. Stir until everything is well combined.
Now, gently fold the wet ingredients into the dry ingredients. Be careful not to overmix; you want to combine them until just incorporated.
Line a muffin tin with liners and scoop the batter into each liner, filling them about two-thirds full.
Place the muffin tin in the preheated oven and bake for 20 to 25 minutes.
