Fry hamburger until fully cooked, then drain and set aside
Saute vegetables in butter.
Melt butter, then saute vegetables until softened.
In a separate kettle, cook potatoes in beef broth with garlic and onion powder; once broth is boiling, reduce heat and simmer until potatoes are tender
In a small bowl, whisk together milk and flour.
Stir flour mixture into soup, whisking until smooth, then simmer until it is thickened, about five minutes
Stir in sour cream and cheddar cheese until mixed together well
Return fried hamburger to pot, season with salt and pepper, the simmer a few minutes to allow flavors to mix in well
serve in bowls
garnish with parsley or chives