In a large skillet, heat 2 tablespoons of oil and 1 tablespoon of butter over medium heat. While oil is heating, cut steak into serving size pieces. Lightly salt and pepper both sides.
In a shallow bowl beat one egg lightly with ¼ cup of milk. In another shallow bowl, combine flour and all purpose seasoning. Working in batches, first dip the meat in the egg mixture, shaking off the excess. Then, dip in the flour mixture, coating each side. Shake excess off.
Cook in the pan, evenly browning both sides. Do not crowd the pan, this will cause excess moisture and the meat will not brown properly and get soggy. Carefully watch your temperature, you don't want it to burn. I find that a medium-low to medium temperature is best. The goal is to get a pretty brown color on both sides, not to cook the meat through. (The meat will finish cooking in the last stage.)
As you are cooking, add additional oil and butter as needed, a little at a time. If you are trying to move the meat and flip it and it sticks to the pan, it probably isn't ready to be turned. Sometimes, this takes a little practice, but the key is to watch your cooking temperature. Once meat is brown, set aside.
Wash and drain mushrooms, and pat dry. Slice into ¼ inch slices. Add 1 or 2 tablespoons of butter to the same pan you cooked the meat in. Use a fork or spoon to loosen up the brown bits from the bottom of the pan and stir it with the butter. Add mushrooms to the pan. Salt and pepper very lightly and let them cook on one side. Toss and stir occasionally, but let them brown and soak up all of the beef and butter flavors.
Once mushrooms are brown, add the mushroom soup, the rest of the milk, sour cream, and Worcestershire sauce. Combine well, and place the meat back into the pan. Turn each piece to make sure it is completely coated with the mushroom sauce.
Cover pan, reduce to a simmer and let cook for about 30 minutes or until meat is tender.
Serve with hot egg noodles cooked according to package directions, or mashed potatoes.
Nutritional information does NOT include the egg noodles.