Crockpot Chicken & Herb Dumplings

• 10 onions (white)
• 2 garlic (cloves)
• 1 salt and pepper
• 1 bay leaf
• 1 dry biscuit mix
• 1/4 powdered marjarom
• 800 gr chicken (whole)
• 240 ml sour cream
• 120 ml dry wine (white)
• 90 ml milk