This is a great Sabbath morning treat filled with Swiss cheese & mushrooms!
Prick bottom and sides of pie shell and bake at 450 degrees for 12–15 minutes; remove. Reduce oven to 350 degrees.
Brown beef and onion; drain. Mix in soup, eggs, milk, spices, cheese and mushrooms. Pour into partially baked pie shell. Cover edges of pie shell with foil. Bake for 60 minutes until knife inserted in center comes out clean.