Foryoueats: Creamy Broccoli Casserole

Ingredients

• 600g / 1.2 lb broccoli florets , small to medium (2 large heads, Note 1)
• 60g / 4 tbsp unsalted butter
• 4 garlic cloves , minced
• 6 tbsp plain flour
• 2 cups milk , preferably warm (full or low fat)
• 1 1/2 cups chicken broth/stock , preferably warm
• 1.5 cups cheddar cheese, freshly grated (Note 2)
• 1/2 cup grated parmesan cheese
• Salt and pepper
• Topping:
• 1/2 cup panko breadcrumbs
• 1/4 cup grated parmesan cheese
• 20g / 1.5 tbsp unsalted butter, melted