Line the base of a springform pan with baking paper, grease the sides. Place the dough in the tin, cut away the overlapping dough to create a rim of approx. 4 cm. Place the cut-away dough on the other two sides to create a rim of approx. 4 cm, press down firmly.
Coarsely grate the sweet potatoes and carrots. Spread the vegetables on top of the dough.
Whisk the milk, eggs, salt, pepper and nutmeg in a measuring jug, grate the cheese on top. Mince in the garlic.
Pour the sauce over the vegetables.
Cut the sweet potatoes into approx. 5 mm slices.Arrange on top of the quiche.
Approx. 40 mins. in the lower half of an oven preheated to 220°C.