Wash the blueberries, drain them well, and set aside.
Add the erythritol and vanilla xylitol to a mixing bowl.
Melt the coconut oil in a small saucepan and pour it over the sweeteners. Mix with a whisk.
Add the eggs and whisk until combined.
Add the baking powder, yogurt, and flours. Mix everything evenly with a spoon.
Finally, gently fold in half of the blueberries.
Spoon the batter into silicone muffin molds, filling them about ¾ full. Sprinkle the remaining blueberries on top.
Bake in a preheated oven at 200°C (392°F) for 20–22 minutes.
Once baked, leave the muffins in the molds and allow them to cool completely. Remove them only after they are no longer warm.
Tip: Instead of blueberries, you can make these muffins with any seasonal fruit.