Prep Time 20 minutes mins
Cook Time 40 minutes mins
Resting Time 10 minutes mins
Total Time 1 hour hr 10 minutes mins
For even cooking, dice the sweet potatoes uniformly at 1/2 inch so they soften in sync with the peppers and onions. If you prefer a spicier bake, swap half the red enchilada sauce for a medium or hot variety or add 1/4 teaspoon cayenne to the filling. Corn tortillas hold up best but warm them briefly or lightly steam to prevent cracking during assembly. Make it dairy-free by omitting cheese or using a plant-based alternative, and add 1/4 cup nutritional yeast to the filling for savoriness. The casserole can be assembled up to 24 hours ahead and refrigerated; add 5 to 10 minutes to the covered bake time. Leftovers store well for 4 days refrigerated and reheat nicely in a 350°F oven covered with foil or in the microwave with a damp paper towel to keep moisture.