PLACE cabbage in large microwaveable bowl. Add water; cover with waxed paper. Microwave on HIGH 4 to 5 min. or until cabbage is softened, but not fully cooked.
MEANWHILE, brown meat with onions in large skillet; drain. Transfer to medium bowl. Add egg, quinoa, half the parsley and paprika; mix lightly.
SPOON 1/3 cup meat mixture down center of each cabbage leaf; fold sides and ends of leaf over filling to completely enclose filling. Place, seam sides down, in skillet. Add broth; bring to boil. Cover; simmer on medium-low heat 30 min. or until liquid is reduced to about 1/2 cup.
TRANSFER cabbage rolls to platter, reserving liquid in skillet. Cover cabbage rolls to keep warm. Whisk tomato paste into reserved liquid; bring to boil. Simmer 1 min. or until slightly thickened, stirring frequently.
DRIZZLE cabbage rolls with sauce; sprinkle with remaining parsley. Serve topped with sour cream.