Preheat oven to 400 degrees F.
Prepare all ingredients. Mash sweet potatoes, and season with lime juice, cumin and sea salt. Shred cheese and slice olives. Make sure turkey in either shredded or chopped in small pieces.
Use a 9 x 13 baking dish, and begin by adding 1/2 cup enchilada sauce to the bottom of the pan, and spread into a thin, even layer.
Wrap tortillas in a thin kitchen towel, and microwave for 20-30 seconds. The tortilla should be warm enough to be pliable. Most traditional recipes call for the tortillas to be pan fried to soften them, but that's really unnecessary - cooking them in sauce will make them soft and moist after baking.
Dip 1 tortilla into enchilada sauce to fully coat it on both sides, then lay it in the baking dish, and add a spoonful of mashed sweet potatoes, followed by turkey, spinach, olives and a light sprinkling of cheese.
Repeat with the other tortillas. This can be split into 2 small pans or put them all in 1 large pan.
Top rolled enchiladas with the remaining sauce, and then sprinkle the rest of the cheese and olives on top.
Cover the dish in foil, and bake for 30 minutes, until sauce and cheese are bubbling.
Remove the foil, and continue to bake for another 5 minutes to lightly brown the top.
Let sit for 5-10 minutes before attempting to slice enchiladas and serve.
Top with avocado slices, more sauce, cilantro, jalapeños, or guacamole for a festive meal.