Many times fish tacos come with a creamy white sauce on top. To make that sauce for your taco bowls, blend together 1/2 cup plain Greek yogurt, 1/2 cup low-fat mayonnaise, 2-3 tbsp lime juice, 1/2 tsp cumin, salt, pepper, and a splash of hot sauce if desired. You can also blend cilantro or jalapeno right into the sauce.