Baked Shells With Mushroom Cream

• 1/4 pimentos (sliced)
• 350 ml milk divided
• 280 gr chicken (diced cooked)
• 200 gr peas defrosted (frozen)
• 120 ml chicken broth
• 60 gr parmesan cheese more for passing (grated plus)
• 40 gr mushrooms (canned sliced)
• 28 gr unseasoned bread crumbs
• 8 gr cornstarch