How to Make It
Cook pasta according to package directions, omitting salt and fat; drain.
Heat broccoli according to package directions; cool slightly. Combine stock, milk, and flour in a bowl. Place broccoli and stock mixture in a blender; blend until smooth.
Heat a large skillet over medium-high heat. Coat pan with cooking spray. Sprinkle chicken with 1/4 teaspoon salt and 1/4 teaspoon pepper. Add chicken to pan; cook 4 minutes. Add garlic; cook 30 seconds, stirring constantly. Add broccoli mixture to pan; bring to a boil. Cook 5 minutes or until slightly thickened. Stir in pasta, remaining 1/4 teaspoon salt, and remaining 1/4 teaspoon pepper. Stir in cheese. Top with green onions.