Preheat oven to 350F and grab a 2-quart casserole dish. Add dry pasta to a pot of boiling water and cook for 7-8 minutes. Drain and rinse with cold water.
In a large skillet, sauté the chopped onion, jalapeno, and peppers in the olive oil over medium heat for about 7-8 mins.
Add the taco seasoning, drained and rinsed black beans, and 1 cup of the enchilada sauce. Stir well and cook for another 5 mins.
Stir in the cheese, pasta, and chopped green onion. Season with salt and pepper to taste.
Spread ½ cup of enchilada sauce over the bottom of the casserole dish. Scoop on the skillet mixture and spread out evenly. Spoon on the rest of the sauce on top and sprinkle with cheese.
Bake for 15-20 mins at 350F until heated through. Sprinkle with crushed nacho chips, chopped avocado, salsa, and sour cream just before serving.
