Pre-heat oven to 200°C (390°F).
In a medium bowl, whisk together the egg and stevia until light and fluffy, about 5 minutes. Add in the milk, yogurt and vanilla and whisk again until fully combined.
Sift in the flour and baking powder and whisk until combined. Fold in the blueberries.
Divide the batter evenly between 6 prepared muffin cases and bake for 10-15 minutes or until a toothpick inserted into the center comes out clean.
Allow the muffins 5-10 minutes to cool before enjoying!
