Can you use ricotta cheese in a quiche instead of creme fraiche?

Yes, you can use ricotta cheese in a quiche instead of crème fraîche. Ricotta will give the quiche a slightly different texture and flavor, making it creamier and a bit milder. To enhance the richness, you might consider mixing the ricotta with a little cream or milk. Adjusting seasonings will help balance the flavors in your dish.