Preheat the oven to 400 degrees F (200 degrees C).
Place pie crust in a 9 inch pie plate; set aside. Snip off mushroom stems; cut large mushrooms in half.
Crumble sausage into a large skillet; add mushrooms. Cook on medium high heat until sausage is browned and all liquid from mushrooms has evaporated. Drain and discard grease. Stir parsley into sausage mixture.
Beat eggs in a large bowl; whisk in half and half, Parmesan cheese, and salt; stir in sausage mixture until well blended. Pour egg mixture into the prepared pie crust.
Bake in the preheated oven until crust is well browned and the filling is set, 25 to 30 minutes. Let stand briefly before serving.
Sausage Mushroom Quiche · Dinner Match Lab | Dinner Match Lab