Beat cream cheese, cheese and sour cream until well blended. Stir in olives, chilies, green onions, garlic powder, and salt.
Spread mixture over tortillas and roll up tightly. Wrap each roll in plastic, twisting ends to seal; refrigerate several hours.
Remove plastic. Using a serrated knife, cut each roll into 1/2- to 3/4-in. slices. Serve with salsa.