Preheat the oven to 180°C/gas 4. Line the mini tins with paper liners.
In a large bowl combine the mascarpone cheese, egg whites and vegetable oil. Using a hand mixer, beat the ingredients until combined and creamy. Add the cake mix and water and mix until smooth, about 3 minutes.
Fill the mini cups to just below the rim and bake until puffed and golden, about 18 to 20 minutes. Remove from the oven, let cool slightly in the tin then transfer the cupcakes to a wire rack.
Meanwhile, puree the strawberries in a blender or small food processor. Place the icing sugar in a medium bowl. Pour in the strawberry puree and whisk until smooth. Top the cooled cupcakes with the strawberry glaze.
Let the cupcakes sit for a few minutes for the glaze to firm up, then serve.