Mix the cottage cheese, sour cream, hot sauce and cumin in small bowl; set aside.
Layer the pita chips evenly on 2 large microwave-safe plates. Top each plate with half of the beans and shredded cheese. Microwave 1 plate on high for 1 minute or until cheese is melted.
Drop half of cottage cheese mixture by spoonfuls over the melted cheese on the nachos. Top with half of chopped green onions and tomato.