ingredients
1    pound   peeled cooked shrimp, (see Ingredient Note), tails removed, diced
1    cup   frozen corn, thawed
2    4 ounce cans  chopped green chiles, (not drained)
2    cups   canned green enchilada sauce, or green salsa, divided
12      corn tortillas
1    15 ounce can  nonfat refried beans
1    cup   reduced-fat shredded cheese, such as Mexican-style cheese blend, Monterey Jack or Cheddar
1/2   cup   chopped fresh cilantro
1      lime, cut into wedges
directions
Preheat oven to 425 degrees F. Coat a 9-by-13-inch glass baking dish with cooking spray.
Combine shrimp, corn, chiles and 1/2 cup enchilada sauce (or salsa) in a microwave-safe medium bowl. Cover and microwave on High until heated through, about 2 1/2 minutes.
Spread 1/4 cup enchilada sauce (or salsa) in the prepared baking dish. Top with a layer of 6 overlapping tortillas. Spread refried beans evenly over the tortillas. Top the beans with the shrimp mixture, followed by the remaining 6 tortillas. Pour the remaining sauce (or salsa) over the tortillas. Cover with foil.
Bake the casserole until it begins to bubble on the sides, about 20 minutes. Remove the foil; sprinkle cheese on top. Continue baking until heated through and the cheese is melted, about 5 minutes more. Top with cilantro and serve with lime wedges.
Tips:
Ingredient note: Shrimp is usually sold by the number needed to make one pound. For example, "21-25 count" means there will be 21 to 25 shrimp in a pound. Size names, such as "large" or "extra large," are not standardized, so to be sure you're getting the size you want, order by the count (or number) per pound. Both wild-caught and farm-raised shrimp can damage the surrounding ecosystems when not managed properly. Fortunately, it is possible to buy shrimp that have been raised or caught with sound environmental practices. Look for fresh or frozen shrimp certified by an independent agency, such as Wild American Shrimp or Marine Stewardship Council. If you can't find certified shrimp, choose wild-caught shrimp from North America - it's more likely to be sustainably caught.
MAKE AHEAD TIP: Prepare through Step 3, cover and refrigerate for up to 1 day. Allow the cold baking dish to warm slightly before placing in a hot oven.
NUTRITION INFORMATION

Per Serving: cal. (kcal) 281, Fat, total (g) 6, chol. (mg) 121, sat. fat (g) 2, carb. (g) 37, fiber (g) 6, pro. (g) 23, vit. C (mg) 11.81, sodium (mg) 709, Potassium (mg) 241, iron (mg) 3.6, Vegetables () 1, Starch () 2, Lean Meat () 2, Percent Daily Values are based on a 2,000 calorie diet