Instructions
Microwave potatoes as directed on package. Meanwhile, cut peppers lengthwise in half; remove and discard membranes and seeds.
Place potatoes in medium bowl. Add 1 Tbsp. butter and milk; mash until ingredients are well blended and potatoes are mashed to desired consistency.
Microwave broccoli as directed on package. Add to potatoes along with the cheese; mix well. Spoon into peppers. Cut remaining butter into small pieces; place over potato mixture. Top with onions.
Bake 25 to 30 min. or until heated through.