Stuffed Chicken Breasts with Pasta with milk

1 tablespoon olive oil , divided 8 ounces sliced mushrooms, finely chopped 1/3 cup shallot , minced 1 cup fresh baby spinach 2 tablespoons fresh parsley ,[...]

2 tablespoons hard margarine (or butter) 2 tablespoons finely chopped onions 2 tablespoons finely chopped celery 1 cup coarse dry breadcrumbs 1 tablespoon[...]

1 1/2 teaspoons olive oil 1 1/3 thinly sliced spring onions (about 1 pound) 3/4 teaspoon salt , divided 1/4 teaspoon fresh ground black pepper 3/4 cup[...]