Preheat your oven to 375°F (190°C).
Place the pie crust in a 9-inch pie plate and set aside.
In a mixing bowl, whisk together the eggs, milk, salt, pepper, and nutmeg (if using).
Stir in the grated cheese and chopped vegetables into the egg mixture.
Pour the filling mixture into the prepared pie crust.
Bake the quiche for 35 to 40 minutes, or until the filling is set and lightly golden on top.
Remove from the oven and let it cool for 10 minutes before slicing.
Serve warm or at room temperature, garnished with fresh herbs if desired.