Created by KittenCal on February 1, 2012
Step 1: Preheat oven to 350 degrees.
Step 2: Bake the thawed pie crust for about 8-10 minutes (crust should be just a very pale light brown and baking time will vary depending if you set the crust on a baking sheet or not).
Step 3: In a skillet cook the ground beef until no longer pink. Add in onion; cook stirring a few minutes; drain fat. Add in garlic and cook 2 minutes. Cool slightly.
Step 4: In a bowl add the eggs, whisk vigorously. Add milk then whisk again, then the mayonnaise (you will need to whisk vigorously or small mayonnaise lumps will remain). Mix in the beef mixture, mushrooms, Parmesan cheese and 1 cup shredded cheddar cheese. Season with seasoned salt and pepper to taste. Transfer into the partially baked crust. Place the pie plate on a baking sheet to catch any spills.
Step 5: Bake at 350 degrees F (bottom oven rack) for about 30 minutes. Remove sprinkle with remaining 1 cup shredded cheddar cheese (or more) and allow to stand for 5-7 minutes or until the cheese is melted.