Preheat oven to 190C. Prepare 30 mini muffin paper baking cups.
Sift together flour, baking powder, and salt. In a separate bowl, mix together vanilla bean paste, butter, sugar, egg and milk.
Add wet ingredients to dry ingredients, and mix until just combined.
Half fill each well with mixture, press 1 or 2 berries into the centre of mixture, then top with a little more of the muffin mixture.
Bake for 10-15 minutes – until cooked through. Allow to cool completely before icing.
Prepare Buttercream Icing according to packet instructions. Pipe or spoon on top of muffins and finish with a blueberry.