Prepare a bed of hot coals or a campfire with low flame.
Pour the oil into the Dutch oven and set on a grate over the fire.
When the oil is hot, stir in the ground beef and onion, and cook, stirring frequently, until the beef is cooked through and the onion is softened, about 8 minutes.
Add the tomato paste, chili powder, cumin, oregano, salt, and pepper and cook, stirring constantly, until fragrant, about 1 minute.
Stir in the tomatoes, beans, macaroni, water, and Worcestershire sauce. Bring to a simmer, cover, and cook until the pasta is al dente, 12 to 15 minutes.
Remove from the heat and add the cheese. Stir constantly until the cheese is melted and the sauce is creamy. If the sauce is too thick, add a splash of water or broth. Season to taste.
Ladle into bowls and serve immediately with extra cheese, sour cream, scallions, hot sauce, and sliced jalapeños, if desired.