Mix butter, onion powder, chicken broth, carrots, parsely, and garlic powder together in large pot

Bring to boil and simmer, uncovered, 4-5 minutes

While warming mixture, brown the ground beef (seasoned with onion powder); drain

When mixture is done simmering, mix the ground beef and potatoes into the pot

Bring to a boil and let simmer, covered, 15 minutes

While that is simmering, make the white sauce with the flour, butter, and evaporated milk

Whisk well to remove lumps

When mixture is done simmering, add the white sauce

Stir well for 2-3 minutes

Add Velveeta, adding a thin slice at a time and stirring constantly to allow it to melt

Add sour cream, stirring constantly

Once the Velveeta and sour cream have thoroughly melted and been mixed in, remove from fire and allow to sit, covered, for 10 minutes

Stir again and serve