Preheat oven to 180 ￼celsius.
Add into a bowl flower , baking powder and salt.
On another big bowl mix sugar and butter until smooth.
Add to the big bowl egg , yogurt and vanilla extra , mix.
Add to the big bowl the flower mixture and mix.
Fold in the blueberries to the mixture.
Put the mixture in the muffin templates.
Put into clean bowl flower, butter , sugar and salt. Mix in your hands and put on the muffin mixture.
Put the muffins into the oven for 25-30 minutes.