Escarole oven dish with ham and cheese

Ingredients

• 1 kg fresh escarole
• 200 gram diced ham
• 300 gram grated cheese (we've used Gouda and old cheese)
• 50 gram butter
• 60 gram all-purpose flour
• 750 ml milk
• 2 bay leaves
• 2 tablespoons curry powder
• pepper and salt to taste
• 1 large onion
• 3 garlic cloves
• olive oil