If using a pressure cooker set to saute and add olive oil, diced onions, and meat. Cook until no longer pink. Turn pot off. If using stovetop do this in a pot on med. heat. Slow cooker method needs meat precooked so use a skillet and then put cooked meat into your Crockpot.
Add all other ingredients into your pot and stir. On a pressure cooker close lid and steam valve. Set to pressure cook, high, for 10 minutes. Then do a quick release. If on stovetop put on low with lid ajar and allow to simmer for 10-15 min. stirring intermittently so it doesn't burn on bottom.
The slower and longer it cooks the more the flavors will be enhanced. So, using your slow cooker is a great method. Just add cooked meat and all other ingredients, stir, and set on low for 8 hours or high for 4 hours. Do not cook on stovetop longer than 20 minutes on low.
Serve immediately topped with cheese, sour cream and chives!