For the crumbles, place the oat flakes, flour, thick juice and butter in flakes in a mixing bowl. Work into crumbles with your hands and chill.
Pears wash, clean, quarter, remove core and dice pear quarters. Cut the vanilla pod in half lengthwise and scrape out the pulp. Simmer 100 ml water with 2 tablespoons sugar, vanilla pod and pulp for about 10 minutes, remove vanilla pod.
Mix the pears with the syrup and pour into ovenproof glasses (approx. 240 ml each).
Spread the crumbles on the compote and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 10 minutes. In the meantime mix yoghurt, quark, 3 tbsp. sugar and lemon juice.
Remove pear crumble from the oven and serve with yoghurt cream.