Lemon tartlets/ Dessert/ Tart recipe

380-390 g condensed milk 200 g sour cream 100 ml lemon juice __________ 1 egg 100 g butter 50 g sugar 200 g flour 2 g baking powder (1/2 tsp) 5 g vanilla sugar a pinch of salt ______ Bake in an oven preheated to 220°C for about 15 minutes.