GRATE potatoes using large hole of box grater; place potatoes on center of large clean kitchen towel. Bring up ends of towel and twist together to form a pouch. Holding the pouch over sink, squeeze out excess moisture from potatoes. Place potatoes in large bowl. Add onions, eggs, flour, cinnamon, salt and pepper; mix well.

HEAT oil in medium nonstick skillet on medium-high heat. For each latke, carefully drop 1 tablespoonful of the potato mixture into skillet, cooking two to three latkes at a time. Immediately spread each mound into thin circle with back of spoon. Cook 3 to 4 min. on each side or until golden brown on both sides. Remove latkes from skillet; drain on paper towels. Repeat with the remaining potato mixture.

SERVE each latke topped with 1 tsp. of the sour cream.