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Place cupcake cases into a muffin pan.  Add the vanilla. Beat in well after adding each one. Stir together. Then, pour the strawberry puree into the batter. Mix well to combine.   Cool on a wire baking rack.
Preheat the oven to 180ºC. Sift the flour and baking powder into the mixing bowl. In another mixing bowl, beat together the sugar and butter until creamy. Gradually add the eggs, one at a time. Pour the flour mix into the liquid mix. Pour in the milk. Pour the batter into the cupcake cases. Place in the oven and bake for 13-15 minutes. Remove from the oven.