Pour 50g white chocolate into a bowl. Melt in the microwave. Then add the 35g puffed rice and mix well. Pack the puffed rice into a circle with the back of a spoon. Carefully remove the circle, then proceed with the remaining tartlets. Place in a cool place to allow the chocolate to harden slightly.
Whip the cold cream and mascarpone with an electric mixer. Gradually add powdered sugar. Line a piping bag fitted with a hollow tip and poach on the puffed rice in the middle.
Arrange halved strawberries around the whipped cream. I decorated with mint leaves.