Preheat the oven to 400 degrees Fahrenheit and line a large baking sheet with parchment paper for easy cleanup.

Slice the sweet potatoes in half lengthwise and coat the flat sides lightly with olive oil. Place the sweet potatoes flat-side down on the baking sheet. Bake until they’re tender and cooked through, about 30 to 35 minutes. Leave the oven on.

Pour enough salsa verde into a 9 by 13-inch baking dish to lightly cover the bottom (about ½ cup). In a medium mixing bowl, combine all of the remaining filling ingredients.

Once the sweet potatoes are cooked through and cool enough to handle, scoop out the insides with a spoon. Discard the potato skins, and lightly mash the sweet potatoes.

Stir the mashed sweet potato into the bowl of filling, and season to taste with additional salt and pepper.

Warm up your tortillas, one by one in a skillet, or all at once in a microwave. Wrap them in a clean tea towel.

Working with one tortilla at a time, spread about ½ cup filling down the center each tortilla, then wrap both sides over the filling and place it in your baking dish.

Top with the remaining salsa verde and cheese. Bake for 25 to 35 minutes, until sauce is bubbling and the cheese is lightly golden.

Let the enchiladas cool for about 5 minutes. Whisk the sour cream and water together to make a drizzly sour cream sauce. Drizzle it back and forth over the enchiladas, then top them with cilantro and red onion. Serve.