In a bowl, whisk the egg and sugar by hand with a whiskuntil the mixture is light and fluffy. Then, add the oil, milk and yogurt.
Separately, mix together the flour, baking powder, baking soda, salt and the vanilla seeds. Combine them with the liquid ingredients. Mix with a whisk until the mixture is blended. Combine the blueberries.
Note: if you use the frozen ones, add them still frozen, do not let them defrost otherwise they will color the dough purple!
IMPORTANT: do not mix too much. The mixture must be lumpy! Line a muffin pan with the cups and, with the help of an ice cream scoop, fill them to the top.
Bake at 180 degrees for 20 minutes. Delicious blueberry muffins are ready!