In a bowl combine gluten-free flour, salt, pepper, paprika. Add in the slice beef and coat well. Shake off excess flour and fry meat until slightly browned. Place just the meat (reserve oil and drippings for later) in a crock pot and cook on high for 1 hr.
Turn crock pot to low, add in gluten-free beef broth (enough to cover the meat). Stir in garlic and onion powder (if using) and 2 additional tablespoons of Paprika (to be honest this can be estimated- use more or less to your liking).
Warm up frying pan with drippings from cooking the meat at a medium high. Add in wine and cook for about 1-2 minutes- add into the crock pot.
I let this sit all afternoon to really get the flavor and the meat tender
At dinner time turn crock pot back to high and bring to a slight bubble. Slowly add in sour cream stirring slowly to assure everything is mixed well. At this point you can add in cornstarch to thicken the sauce.
Serve with rice or gluten-free noodles. You can also saute some mushrooms with wine and serve on top as well.