Heat vegetable oil in a large oven-safe skillet over medium heat.
Add the diced onion and butternut squash to the skillet. Sauté for 8 to 10 minutes, stirring occasionally, until the squash begins to soften.
Stir in the red bell pepper, minced garlic, cumin, chili powder, and salt. Cook for an additional 5 minutes until the peppers are tender.
Add the rinsed black beans and enchilada sauce to the skillet, stirring to combine. Bring the mixture to a gentle simmer.
Fold in the corn tortilla strips gently until they are thoroughly coated in the sauce.
Reduce heat to low, cover the skillet, and simmer for 5 minutes until the squash is fork-tender and the tortillas have softened.
Distribute the shredded cheese evenly over the top of the mixture. Cover for 2 to 3 minutes until the cheese is completely melted.
Remove from heat and garnish with chopped cilantro before serving.