Preheat the oven to 160ºC. Spray the bun tin with low-calorie cooking spray, and use it to grease the tin well.
Take a square of filo pastry and lightly brush one side with beaten egg. Place it, egg side up, into a hole in your bun tin, then gently press it down to form a case. Repeat with a second square, layering it over the top at a slight angle to the first piece, and press it in again so it lines the tin neatly. Keep going until you’ve made all your cases, then cover any leftover filo with a clean, slightly damp tea towel so it doesn’t dry out while you finish assembling.
Repeat this process until you've made 12 pastry cases. Then place in the preheated oven for 5-6 minutes, until crisp and golden. Watch carefully, as the pastry cases will cook very quickly. Remove from the oven and leave to cool in the tin.
While the pastry cases are cooling, make your filling by adding the cream cheese to a small bowl, and mixing until smooth. Stir in the yoghurt, sweetener and vanilla essence. Mix everything together until it’s fully combined and silky.
Carefully remove the cooled pastry cases from the tin and fill each one with the creamy filling. Spread it out evenly, then top each tart with a few slices of fresh strawberries.
Place the jam in a small dish or cup and stir until smooth. Warm in the microwave for about 10 seconds, then stir in 1 teaspoon water to make the jam runnier in texture. Then push the jam through a sieve to remove any small pips.
Use a teaspoon to drizzle a little jam over the strawberries, gently spreading it out to give them a glossy glaze.
Serve alone, or as part of a selection of teatime treats.