Preheat the oven to 375 degrees Fahrenheit. Get a baking dish and grease the muffin liners.
Add butter and sugar to a bowl. Beat it with a mixer for no more than 2 minutes, so that the mixture stays fluffy.
Add eggs, baking powder, salt and vanilla extract. Mix until smooth.
Add flour and milk, but make sure to alternate to get the desired consistency.
Add fresh blueberries. Stir the batter carefully with a spatula to not damage the berries.
Fill each paper liner with batter, sprinkle each muffin cup with granulated sugar.
Put in a preheated oven for 30 minutes.
If you follow the right ratio of ingredients, the muffins turn out very fluffy and delicious. It is important not to leave them in the oven for too long so that they do not turn out to be too dry.
