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Ingredients

• 6 tablespoons butter, plus more for baking dishes
• kosher salt and black pepper
• 1 pound penne rigate
• 1 teaspoon olive oil
• 2 boneless, skinless chicken breast halves (about 8 ounces each), halved horizontally
• 1/2 cup plus 2 tablespoons flour
• 6 garlic cloves, finely minced
• 6 cups milk
• 10 ounces white or cremini mushrooms, trimmed and thinly sliced
• 1 cup sliced oil-packed sun-dried tomatoes, drained
• 1 1/2 cups shredded provolone or mozzarella
• 1 1/2 cup freshly grated Parmesan (about 6 ounces)