Heat the butter in a large skillet over medium heat. Add the onion and garlic and cook for 1 minute. Add the ground chuck and sprinkle with salt and pepper. Cook the meat, crumbling as you go, until cooked through, about 5 minutes. Add the tomato paste and cook for about 30 seconds.
Add the noodles, broth, 1 cup hot water, the mustard, paprika and Worcestershire sauce. Give a big stir and bring to a simmer. Cover and allow everything to simmer, stirring occasionally and adding up to 1/2 cup more water if necessary, until the pasta is al dente and the sauce has thickened, about 12 minutes. Stir in the sour cream and heavy cream and cook for 1 additional minute or until the pasta is tender.
Remove from the heat. Sprinkle over the chives and serve directly from the pan.