Preheat the oven to 180°C (356°F).
Mix almond flour, baking powder, and salt in a bowl.
In another bowl, combine melted butter, erythritol, eggs, and vanilla extract.
Combine the dry ingredients with the wet ingredients to form the batter.
Add blueberries to the batter and gently mix.
Divide the batter into muffin molds.
Bake in the oven at 180°C for 20-25 minutes.