Take the puff pastry out of the refrigerator 5-10 minutes before use. Wash the asparagus, cut off the woody ends, then peel the bottom 1/3 of the stems. Heat olive oil in a large frying pan.
Brown the asparagus in it for 3-4 minutes all around. Season with salt and pepper and remove.
Wash the thyme, shake dry and chop half of the leaves finely. Whisk sour cream, eggs and cream and season with nutmeg, salt and pepper. Add chopped thyme. Grease a tart dish (approx. 24 cm Ø) with lift-off base and sprinkle with breadcrumbs.
Roll out the puff pastry and cut out a circle (approx. 29 cm Ø). Line the mould with the puff pastry circle, fold the protruding pastry inwards and press firmly.
Cut the goat cheese into slices. Put asparagus in the form. Spread goat's cheese in between. Pour a sand glaze over it. Bake the quiche in the middle of the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 35-40 minutes. Remove from oven, remove from the mould and garnish with remaining thyme.