(I use chicken tenders cut into chunks)
1/4 c. butter
1 small onion, thinly sliced
2 garlic cloves, minced
2 T flour
1 tsp salt
1 can (14.5 oz) diced tomatoes, undrained
1 c sour cream
2/3 c grated Parmesan cheese
Hot cooked noodles
In a large skillet, brown chicken in butter on both sides (it doesn't need to be cooked through, it will finish cooking with the sauce).Remove and set aside. Add onion and garlic; saute until tender. Stir in flour and salt until blended. Gradually add tomatoes, stir until blended. Bring to a boil. (I add about half a can of water otherwise there isn't enough sauce) Reduce heat; return chicken to pan. Cover and simmer for 30 minutes or until juices run clear.
Remove chicken and keep warm. (You don't need to do this if using chicken chunks) Reduce heat to low; stir in sour cream and Parmesan cheese. (I think the sour cream covers up the Parmesan so I don't add the Parmesan. Why add calories if you can't taste it?) Heat through (do not boil). Serve chicken and sauce over noodles.