Preheat the Oven:

Preheat your oven to 375°F (190°C).

Prepare the Pie Crust:

Place the pie crust in a 9-inch pie dish. Crimp the edges for a decorative touch.

Prick the bottom of the crust with a fork to prevent bubbling.

Pre-bake the crust for about 8 minutes to help it set up and prevent sogginess. Remove from oven and let cool slightly.

Make the Filling:

In a large mixing bowl, whisk together the eggs, heavy cream, and milk until well combined.

Stir in the grated Gruyère, cheddar, and crumbled feta cheese.

Season with salt, pepper, and nutmeg.

Mix in the chopped fresh herbs.

Assemble the Quiche:

Pour the filling into the pre-baked pie crust, making sure the ingredients are evenly distributed.

Bake the Quiche:

Bake in the preheated oven for 35-40 minutes, or until the filling is set and the top is lightly golden.

To check if it's done, insert a knife into the center of the quiche; it should come out clean.

Cool and Serve:

Let the quiche cool for at least 10 minutes before slicing. This resting time helps the filling set up and makes slicing easier.

Cut into wedges and serve warm.