These are sort of a low calorie pop tart and you can fill them with any fruit conserve you like. If you feel energetic you can add a little water to the icing sugar at the end, perhaps a little lemon juice and make a glaze, just make sure to add the additional calories because you will need to use more sugar.
4 Sheets of Fyllo pasty 1 Cup (approximately) of sugar free fruit preserves 1 tablespoon icing sugar Cooking spray
Preheat the oven to 350 degree F. Take the first sheet of fillo pastry and cut in half. Place approximately 1 1/2 tablespoons of the fruit preserves in the top corner. Fold the top left corner of the fillo over the preserves until it meets the right hand side of the pastry and forms a triangle at the top of the strip of pastry. Fold that triangle over again until the top right corner meets the left edge of the fillo. Spray the remainder of the fillo strip with cooking spray and continue to fold until you have folded the entire sheet and formed a neat triangle.
Repeat for the remainder of the fillo pastry sheets. Place the fillo triangles on a sheet of parchment (or silicone baking sheet) and bake until golden brown (about 15 - 20 minutes). Dust with icing sugar and serve warm.
Note - Fillo triangles can be partially baked the day before (i.e. until they just start to turn colour) refrigerated over night and then finished in the oven at the last minute. Something to keep in mind if you are attempting a three course brunch before 11 am.