Yes! In fact, I recommend it. No crust, no problem. Since there’s no crust to get soggy you can prep this a day in advance. After baking your quiche allow it to cool down to room temperature fully before covering and storing in the fridge. When you’re ready, take the quiche out of the fridge and let it come back up to room temperature. Preheat the oven the 350°F. When the oven has heated, cover the quiche with foil so the top doesn’t burn and bake for ~15 minutes.