HEAT oil in large saucepan on medium-high heat. Add onions; cook 5 min. or until crisp-tender, stirring frequently. Add tomato sauce, turkey and 1 Tbsp. peppers; stir. Cook 5 min. or until heated through, stirring occasionally.
WHISK eggs, sour cream and remaining peppers until well blended. Heat large skillet sprayed with cooking spray on medium heat. Add half the egg mixture; cook 3 min. Top with 1/2 cup cheese and half the turkey mixture; cover. Cook 3 min. or until cheese is melted. (Do not stir - eggs should resemble an open-face omelet.) Remove from skillet; roll up. Cut into thirds. Repeat with remaining ingredients.
