Stir together first 6 ingredients until blended. Spread evenly on one side of each tortilla; top with 3 beef slices and, if desired, 2 cheese slices. Sprinkle evenly with shredded lettuce.
Roll up tortillas tightly; wrap in parchment paper or plastic wrap. Chill 8 hours.
Note: For testing purposes only, we used Sargento Deli Style Sharp Cheddar Cheese slices.
* 1/2 cup light sour cream and 1/2 cup light mayonnaise may be substituted.
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