Preheat oven to 400 degrees F.
Warm tortillas in microwave for 20-30 seconds until soft and pliable. Quickly press each one into the well of a muffin tin or jumbo muffin tin, carefully overlapping the sides if necessary and making the bottom as flat as possible. Bake 10-15 minutes, until golden brown.
While tortillas are baking, combine lettuce, tomato, corn, beans, green onions, and cilantro.
For the vinaigrette: Place all ingredients in a jar with a tight-fitting lid and shake vigorously for 1 minute. Dressing can be prepared up to several days in advance and stored in the refrigerator.
When tortillas are done, remove from muffin tin and set on wire rack to cool. Once cooled completely, toss salad and desired amount of dressing together and fill each tortilla up.