Using a large slow cooker, heat potatoes, onion and minced garlic. Add in seasonings and chicken broth. Cook on high for 4-5 hours or low for 7-8. Potatoes should be fork tender. Mash the potatoes in the soup. Crumble package of cream cheese and cheddar in to potatoes. Cook on low for one hour, stirring occasionally (at LEAST until cream cheese is dissolved) can move to warm crock setting or very low and just wait till ready to serve.. or serve immediately. Garnish with whatever desired (we normally use 1T of bacon and some chives, some times a 'dollop' of sour cream) Throw in corn 30 minutes before eating.