Make Sauce: Stir in the low-sodium beef broth, then add a cornstarch slurry (mix 1 tbsp cornstarch with 2 tbsp cold water), dried thyme, and paprika. Allow the sauce to simmer until thickened.
Combine: Mix in the cooked low-carb pasta (or zucchini) and sour cream with the beef mixture.
Serve: Garnish with fresh parsley and an optional dollop of extra sour cream.