Preheat oven to 350 degrees.

In a bowl, combine tuna, sour cream or yogurt, and green salsa. Set aside.

In a microwave safe plate warm tortillas for 1 minute.

Carefully (they are hot) fill each tortilla with tuna filling and roll.

Place rolls in a baking dish. Continue until dish is full.

Cover rolls with enchilada sauce and cheddar cheese.

Bake at 350 degrees for 20 minutes.

Garnish with shredded lettuce, sour cream and avocado if desired.