Preheat the oven to 190C / 374F and grease a non-stick tart tin.
Lightly whisk the egg whites until foamy and add the xylitol. Whisk further until combined and soft peaks begin to form (don't worry if they don't, some sweeteners will stop this!).
Add all remaining ingredients except the strawberries and fold through until evenly combined.
Spoon into your prepared tart tin and top with the sliced strawberries.
Bake for 18 - 22 minutes until lightly golden. Serve warm or refrigerated.