Marilyn's Chicken Casserole

• 1 pkg uncle bens long (grain)
• 280 gr chicken breast in chunks (cooked halves cut)
• 240 ml chicken broth
• 85 gr mushrooms (sliced)
• 55 gr butter
• 40 gr flour
• 40 gr slivered almonds
• 40 gr onion (chopped)
• 9 gr parsley (dried)