Preheat oven to 350 degrees F (175 degrees C).
Heat the olive oil in a large pot over medium-high heat. Add the beef and cook until browned on all sides, about 5 minutes.
Drain off any excess fat.
Stir in the enchilada sauce and taco seasoning. Bring to a simmer, then reduce heat to low and cover. Simmer for 1-2 hours, or until the beef is tender and easily shredded.
To assemble the taco bowls, divide the white rice among four bowls.
Top with the shredded beef, cheese, sour cream, and lettuce.
Option to crush corn chips on top for a fun crunch!
Serve immediately.