Best Green Bean Casserole - Oryana

Ingredients

• 6 tablespoons butter
• 1 medium onion, diced small
• 1 pound button mushrooms, sliced
• 2 teaspoons sea salt
• black pepper to taste
• 1 1/2 pounds green beans, trimmed, cut into bite-size pieces
• ¼ cup all-purpose flour
• 2 cups milk
• 1 pinch grated nutmeg
• 1/2 cup grated Parmesan cheese
• 1/4 cup breadcrumbs
• 1 can Lars’ Own Crispy Onions*