Mix butter, sugar and vanilla extract with an electric mixer until light and creamy
Add orange juice and milk and mix
Mix the flour, salt and baking powder together in a separate bowl
Add flour to the dough and stir until the dough is uniform in texture
Add the blueberries to the batter and stir until they are evenly distributed in the dough
Place paper liners in the muffin tin and then fill them with batter with a spoon
Bake the muffins in the oven at 200°C for 25 min
Let the muffins cool