In a large saucepan, melt butter over medium heat. Add potatoes, onion, celery, garlic, parsely, salt and pepper. Cook for 5-10 minutes, stirring off an on. (Just a soft cook, no browning. Bring 2 C water to boil in microwave; add instant bullion, stir, then pour into saucepan. Then slowly add 1 C milk. Gradually add the next C of milk. Thickening (this is optional): Place 2 T flour in the measuring cup. Whisk in enough COLD water to make a thick gravy. Bring the temp of the soup up to almost boiling, pull of the burner and whisk in flour mixture. This will thicken the soup just a little.Add cheddar cheese to soup (optional) and or top with a T of cheddar cheese and the chopped bacon for garnish.