Put the egg, brown sugar and vanilla paste in a bowl and mix.
Add milk and oil and mix well.
Slowly mix in the white flour and baking powder.
When the dough is well mixed, add another 250 g of blackberries and mix.
Using 2 spoons, fill muffin molds with the resulting mass. Bake in a heated oven at 200 °C for about 20 minutes.
After the muffins are baked and cooled, decorate them with cream. Mix 100 g of blackberries and powdered sugar and stir into the whipped cream. Decorate the muffins with the resulting cream using a syringe or a decorating bag.