Heat olive oil in a Dutch oven over medium heat. Brown beef about 3 minutes then discard extra water. Season with salt and pepper. Add the mushrooms and cook for about 4 minutes stirring few times. Add the flour and tomato paste and cook for 1 minutes.
Add the beef broth and the pasta. Let it boil then lower to simmer and cover. Simmer pasta for 10 minutes stirring occasionally. Add the mustard and sour cream. Garnish with parsley.
Recipe by The Gluten Free at https://www.theglutenfree.com/gluten-free-hamburger-helper/