Onion, Cheese And Bacon Quiche

• 375 oven
• 9 partially pastry (cooked)
• 3 eggs
• 450 gr onions (yellow chopped)
• 90 gr swiss cheese (grated)
• 45 gr butter
• 12 gr flour
• 3 gr salt
• 1 gr nutmeg
• 4 slices bacon crisp (sliced cooked)