Creamy French Onion Soup - Alberta Milk

Ingredients

• 1/4 cup (60 ml) butter
• 3 cups (750 ml) quartered, thinly sliced onions
• 1 1/2 cups (375 ml) water
• 1 1/2 tbsp (22 ml) beef broth mix
• 1/4 cup (60 ml) all-purpose flour
• 1 3/4 cup (430 ml) milk
• 3/4 cup (175 ml) grated Mozzarella cheese
• 3/4 cup (175 ml) grated Swiss cheese
• salt, to taste
• pepper, to taste
• 1 1/2 cup (375 ml) Butter Croutons
• 1 1/2 cup (375 ml) bread, cubed
• 3 tbsp (45 ml) butter, melted