Broccoli Casserole | Saveur

Ingredients

• Kosher salt, to taste
• 4 heads broccoli, cut into small florets
• 2 tbsp. olive oil
• 8 tbsp. unsalted butter
• 8 oz. white button mushrooms, thinly sliced
• 1 ¹⁄₂ cups panko bread crumbs
• 2 tsp. dried sage
• Freshly ground black pepper, to taste
• 3 cloves garlic, finely chopped
• 3 tbsp. flour
• 2 cups milk
• 2 tsp. dry mustard powder
• ¹⁄₄ tsp. freshly grated nutmeg
• 3 oz. cream cheese, softened
• 2 cups shredded cheddar cheese
• ¹⁄₂ cup mayonnaise
• 2 eggs, lightly beaten
• 1 small yellow onion, finely chopped