Heat oven to 450 degrees.
Peel, chop sweet potatoes.
Toss sweet potatoes in a few tablespoons of olive oil. Add salt & pepper to taste.
Spread in an even layer on sheet pan, bake 20-25 minutes until tender and light brown. You can flip halfway through as recommend. (I do not).
Pour black beans into colander, rinse and let sit to drain.
In sauce pan, use medium-high heat to heat 2 tablespoons of olive oil. Add diced carrots, celery and onion with salt and pepper to taste. Stir occasionally until starting to soften 5-8 minutes.
Stir in the garlic, chili spice blend and adobo (optional to make it spicy). Cook approximately 1-2 minutes. I typically add little water too because mine starts to get really dry.
Add in black beans, diced tomatoes and 1/3 cup of water. (cut back water if you already added some) Bring to a boil.
Reduce to a simmer and cook and additional 3-5 minutes until slightly thickened.
Coarsely chop the cilantro.
Stir half of the cilantro into the sauce pan mix.
Trim ends of onions. Chop.
In oven proof dish or skillet, layer sweet potatoes in the bottom. Top with sauce pan mixture. Sprinkle Mexican cheese on the top.
Warm in the oven until cheese melts, 3-4 minutes.
Garnish the top generously with cilantro, green onions and diced avocado.
Serve with your favorite tortilla chips. Enjoy!