Mushroom-Herb Macaroni & Cheese

INGREDIENTS

• 11 tablespoons butter, divided
• 1 pound cremini mushrooms, roughly chopped
• 1 shallot, minced
• Salt & pepper
• 2 tablespoons white wine vinegar
• 4 tablespoons all-purpose flour
• 2 teaspoons chopped fresh thyme
• 2 teaspoons chopped fresh tarragon
• 2 teaspoons chopped fresh chives
• 3 cups whole milk
• 6 ounces shredded Gruyere cheese, divided
• 6 ounces shredded white cheddar cheese, divided
• 1 box (12-16 ounces) elbow or other small pasta
• 1 cup plain bread crumbs