Heat a large pan over medium heat and add 1 lb ground beef. Season with salt and pepper to taste.
When mostly finished cooking, add onions. Cook an additional 3-4 minutes.
Add 1 15 oz jar red enchilada sauce to beef and onion. Remove from heat.
Preheat oven to 350 ℉.
If using a cast iron, remove sauce from pan and into a large bowl, except 1/4 cup. If not, grab a 9x13 pan and spread 1/4 cup sauce on the bottom.
Lay a tortilla on a plate or cutting board.
Add a sprinkle of cheese, about 3 spoons of sauce, beans if desired, and more cheese.
Continue with the remaining 7 tortillas, dividing cheese and sauce evenly but reserve about 1/2 cup of sauce & 1/2 cup cheese.
Lay all of the tortillas in the pan side by side. Top with remaining 1/2 cup sauce, spreading it on the tortillas.
Sprinkle remaining cheese on top.
Place 2 slices of jalapeño on each enchilada. This helps you find where each tortilla is after baked & adds a little spice!
Bake at 350℉ for 25-30 minutes, uncovered.
Top with cilantro, red onion, and sour cream.
Enjoy with my Salsa Rice!