Heat the olive oil in a saucepan over medium heat. Cook the onion until soft, about 5 minutes. Add garlic and cook until tender, about one minute more.
Add the beef and cook until browned, about 10 minutes. Add the ketchup,broth, brown sugar, chili, cumin and paprika. Bring to a boil, then reduce heat to low and simmer for about 30 minutes.Season with salt and pepper.
To serve: Top or fill each arepa with guacamole, beef chili, grated cheese and a dollop of sour cream.