Stacked Sweet Potato and Black Bean Enchiladas

small sweet potatoes, washed and diced

olive oil, divided

yellow onion, diced

red bell pepper, seeds removed and diced

garlic, minced

packed spinach leaves

black beans, rinsed and drained

ground cumin

chili powder

fresh lime juice

chopped cilantro

Salt and pepper,

Old El Paso mild red enchilada sauce

small corn tortillas

shredded Mexican blend cheese or cheddar cheese

avocado, pitted and diced, for garnish