Cut carrot and onions into quarters, place into food processor with garlic cloves. Pulse until vegetables are pureed almost like a paste.
Add the vegetable puree to the pressure cooker with beef broth, ground beef, chili powders, cumin, paprika, brown sugar, and Mexican oregano. Stir to mix and break up the ground beef.
Seal pressure cooker and cook on high pressure for 18 minutes. Allow pressure to release for 10 minutes, then release remaining pressure.
Add masa harina and cook (saute for electric, medium low for stovetop) until thick, about 5-10 minutes.