In a large skillet brown the Italian sausage.
In another skillet heat the olive oil over medium heat. Add the onion, red pepper, green pepper, and garlic. Cook for about 10 minutes until vegetables are getting soft.
Stir in the diced tomatoes, tomato sauce, basil, and oregano.
Stir in the Italian sausage, making sure everything is mixed well.
Stir in the mozzarella cheese.
Preheat oven to 375 degrees.
Place the bottom pie crust into the pie pan.
Add the meat and sauce filling.
Place the top crust over the meat mixture. Trim the edge and seal.
Place in the preheat oven and bake 35 to 40 minutes or until pie crust is a golden brown.