1 1/2 lb. boneless sirloin, cut into 1/8 inch strips
1 (2 oz.) jar sliced mushrooms
2 tbsp. butter
1/2 pkg. dry onion soup mix
2 tbsp. flour
1/2 c. milk
1/2 c. water
1 can cream of mushroom soup
1/2 c. sour cream
1 (8 oz.) pkg. noodles, cooked

Brown meat and mushrooms in butter in skillet on top of stove. Add onion mix, flour, milk, water, and mushroom soup; cover. Cook over low heat for 45 minutes. Stir occasionally. Stir in sour cream. Serve over cooked noodles.