Katie Workman’s Best Chicken Tetrazzini Recipe — The Mom 100

Ingredients

• 12 ounces dried spaghetti ((snapped in half))
• 6 tablespoons (3/4 stick) unsalted butter ((divided))
• 1 medium onion ((halved and thinly sliced))
• 8 ounces sliced mushrooms ((any kind))
• Kosher salt and freshly ground black pepper to taste
• ¼ cup all-purpose flour
• ½ teaspoon dried sage
• 2 cups chicken broth ((preferably less-sodium))
• 1 cup whole milk
• 3 tablespoons dry sherry ((optional))
• ½ cup finely grated Parmesan cheese ((divided))
• 3 cups cubed cooked chicken
• 1 (2-ounce) jar sliced pimentos ((drained))
• ½ cup chopped fresh parsley
• ½ cup shredded Gruyere or Swiss cheese