Preheat the oven to 180°C (350°F).
In a medium bowl, mash the ripe bananas and mix in the melted butter, yogurt, egg, milk, sweetener and vanilla extract until well combined.
Sift through the dry ingredients and mix with a spatula until well combined. Be careful not to overdo it with the mixing*
Pour the batter into a lined loaf pan and bake for 45-50 minutes.
Let the bread cool completely in the pan and cut into 10-12 pieces.
