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 whole 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* (6 ounces) you could also make that 1/2 mozzarella
1 1/2 cup freshly grated Parmesan (about 6 ounces)