Mix California yogurt, California milk and ranch dressing mix together and refrigerate to thicken for ½ hour.
While chilling, chop vegetables and shred cheese.
Lay out tortilla, spread yogurt mix in a thin layer on the tortilla.
Layer meat, vegetables and cheese.
From one side, roll tortilla tightly.
Wrap with plastic wrap and refrigerate for a couple hours to seal flavors.
Remove plastic wrap and slice into 1 inch sections.