MIX egg, spinach, feta cheese, cream cheese spread and onions until well blended. Set aside.

PLACE 1 of the phyllo sheets on a clean work surface. Brush lightly with butter. Top with 2 more phyllo sheets, brushing more of the remaining butter between each layer. Place remaining phyllo between sheets of plastic wrap; set aside.

SPREAD 1/5 of the spinach mixture along 1 of the short sides of the phyllo stack; fold in both long sides, then roll up, starting at 1 of the short sides to make a log. Repeat with the remaining phyllo sheets and spinach mixture to make 4 more logs. Brush with remaining butter. To prevent phyllo from cracking, score logs at 1-inch intervals. Place in large freezer-weight resealable plastic bags or wrap tightly in plastic wrap.

FREEZE up to 3 months. When ready to bake, remove desired number of logs from freezer. Refrigerate, tightly wrapped, several hours or overnight until thawed. Place on baking sheet. Bake in preheated 375°F-oven for 25 min. or until golden brown. Cool 5 min.; place on cutting board. Cut each log into 6 slices with serrated knife to serve.