Chicken & Shrimp Alfredo

Cook pasta according to package directions, omitting salt. Drain, reserving 1/2 cup cooking water.

Meanwhile, heat 1/2 tablespoon oil in a large nonstick skillet over medium-high heat. Add chicken; cook, stirring occasionally, until browned and nearly cooked through, about 7 minutes. Add shrimp, scallions, garlic, 1/2 teaspoon salt and the remaining 1/2 tablespoon oil; cook, stirring often, until the chicken and shrimp are cooked through, about 3 minutes. Transfer to a bowl; cover to keep warm.

Return the skillet to medium heat. Whisk together flour and 1 tablespoon of the reserved cooking water in a medium bowl; stir in half-and-half, cream cheese, pepper, 1/4 cup Parmesan and the remaining reserved cooking water. Add the mixture to the pan and bring to a simmer; cook, stirring often, for 1 minute. Add the chicken-shrimp mixture and remaining 1/2 teaspoon salt; toss to coat. Transfer the mixture to a large bowl; add the pasta and stir to coat evenly. Divide among 6 bowls; sprinkle with parsley and the remaining 2 tablespoons Parmesan.