Ingredients: Kosher salt and freshly ground black pepper 8 ounces ziti  2 tablespoons unsalted butter  1 tablespoon canola oil  2 boneless, skinless chicken breasts 2 cups small cauliflower florets  1/2 medium onion, chopped  1 pound cremini mushrooms, sliced  1 clove garlic, minced  2 tablespoons all-purpose flour  …