Broccoli Casserole with Crispy Onions

Ingredients (9)

• 3 pounds broccoli
• 6 tablespoons Vermont Creamery Unsalted Cultured Butter
• 1/2 yellow onion
• 2 cloves garlic
• 3 tablespoons all-purpose flour
• 2 cups cold whole milk
• 6 ounces Parmesan cheese
• 1 teaspoon kosher salt
• 1/2 cup crispy fried onions