Mix potatoes, broccoli, 1 cup of the cheese, the eggs, onion and seasonings.
Melt 1 Tbsp. of the butter in large nonstick skillet on medium heat. Spoon 2 Tbsp. of the potato mixture into skillet; press lightly to flatten. Repeat with the remaining potato mixture, allowing about 1 inch between pancakes. (You should be able to cook 6 to 8 pancakes at a time.) Cook 2 to 3 min. on each side or until crisp and golden brown on both sides.
Drain on paper towels; place on ungreased baking sheets. Repeat with remaining potato mixture, adding remaining butter as needed.
Sprinkle evenly with cheese.
Broil pancakes, 4 to 6 inches from heat, 1 to 2 min. or until cheese is melted.