3 tablespoons olive oil
1 cup all-purpose flour
5 skinless, boneless chicken breast halves
1 cup shredded mozzarella cheese
1 cup shredded mozzarella cheese
1/2 (4 ounce) can tomato sauce
2 (10 ounce) packages frozen hash brown potatoes
1 (8 ounce) can mushrooms, drained