Heat oven to 350°F. Spray 8-inch square (2-quart) glass baking dish with cooking spray. Cook and drain linguine as directed on package, adding broccoli for last 2 minutes of cook time.
Meanwhile, in 1-quart saucepan, mix soup mix and milk. Heat to boiling over medium heat, stirring constantly. Stir in pepper.
Add linguine, broccoli, tuna and roasted peppers to soup mixture; stir gently to mix well. Spoon into baking dish. In small bowl, mix butter and bread crumbs; sprinkle over linguine mixture.
Bake uncovered 20 to 25 minutes or until top is golden brown.