Form the pie dough into a large deep pie pan, prick the bottom to prevent air pockets. Make an aluminum edge out of tin foil, with ¾-inch strips to prevent edges from over-browning. Can remove for the last 5 minutes of baking.
Mix sausage, mushrooms, onions, grated peppers, and saute in a skillet on low heat until browned. Set aside. Then, in a large bowl, beat eggs, stir in grated cheese, add in meat mixture slowly stirring until well-blended. Pour into pie crust and bake at 350°F until firm in the center. Approx. 45 minutes.