Broccoli Parmesan Casserole Recipe: How to Make It

Ingredients

• 4 bunches broccoli, cut into florets
• 6 tablespoons butter, divided
• 1 small onion, finely chopped
• 1 garlic clove, minced
• 1/4 cup all-purpose flour
• 2 cups 2% milk
• 1 large egg yolk, beaten
• 1 cup grated Parmesan cheese
• 1/2 teaspoon salt
• 1/8 teaspoon pepper
• 1/2 cup seasoned bread crumbs