I've made these shrimp and red pepper enchiladas twice in the past month, once following the recipe to the letter, and once substituting the sour cream with greek yogurt and a little cornstarch. You couldn't tell a difference, and they're really good.
Shrimp-and-Crab Nachos Recipe | MyRecipes.com---way too much cumin...way way way too much, so we altered it and used Penzey fajita seasoning instead. PERFECTION! HUBBY requests again! (lil man wasn't a fan of seafood but like the yogurt sauce..haha)