Microwave potatoes on high for 14-16 minutes. Wrap in foil and allow to stand 5 minutes.
Prepare Broccoli & Cheese Sauce according to microwave directions on package. Stir in tuna and green onions. Microwave an additional minute.
Remove potatoes from foil, cut in half, scoop centers out slightly, and spoon broccoli mixture into potatoes. Sprinkle with Cheddar cheese, if desired.
Notes: Tip: Substitute 1 cup (250 mL) chopped, cooked ham for tuna.