Heat a skillet over medium heat. Add ground beef, sprinkle with a little garlic powder, onion powder, thyme, salt, and pepper. Crumble and brown ground beef until no pink remains adding mushrooms half way through cooking. Drain mixture in a small colander (do not rinse) set aside.

In a medium bowl beat eggs with a wire wisk. Add soup and evaporated milk. Wisk to combine until no clumps remain (except mushroom chunks). Stir in Swiss cheese and cooked beef mixture.

Pour mixture into pie shell. Place in oven. Bake in a preheated 375°F oven for 45 minutes or until top is golden and center barely jiggles when you shake pie. Remove from oven. Let sit for 10 minutes. Slice and serve. Enjoy!