Broccoli with Cheddar Cheese Sauce

Bahan-bahan (6 porsi)

• 1 pound broccoli, (cut into florets)
• 3 tablespoons unsalted butter
• 2 tablespoons all purpose flour
• 1¼ cups milk
• ¼ cup heavy whipping cream
• ½ teaspoon Dijon mustard
• 6 ounces sharp or mild white cheddar cheese, (shredded)
• kosher salt