In 3-quart saucepan, cook linguine as directed on package, adding frozen broccoli for last 3 to 5 minutes of cooking time; drain and return to saucepan.
Meanwhile, in 2-quart saucepan, heat cooking sauce over medium heat 2 minutes. Stir in 2 teaspoons of the miso paste with whisk. Simmer 5 to 8 minutes, stirring occasionally, until slightly thickened. Taste; add remaining 1 teaspoon miso paste, if desired. Remove from heat; stir in yogurt and Sriracha sauce.
Add sauce to cooked linguine and broccoli; toss. Divide mixture among 4 bowls. Sprinkle with onions. Serve with lime wedges.