1 pie crust rested at room temperature |
2 pound(s) yellow onions, thinly sliced |
1 tablespoon(s) canola or olive oil |
1 tablespoon(s) granulated sugar |
salt & cracked black pepper to taste |
1/2 pound(s) mushrooms, sliced |
4 ounce(s) emmanthaler or swiss cheese, shredded |
1 egg, beaten with 1 tablespoon water |