Bring pot of salted water to a boil. Cook egg noodles until al dente. Drain and reserve to the side.
Meanwhile, in a large skillet melt 2 tablespoons of butter and saute the sirloin. Season with salt and pepper. When sirloin is browned, remove from pan and reserve to the side.
Add onions and a pinch of salt, cook until onions are soft and lightly browned. Add garlic and cook for 30 seconds longer. Remove onions from the pan and reserve to the side.
Add the mushrooms and cook until mushrooms are browned and soft. Return the onions, and meat back to the pan.
Add cream of mushroom soup and milk blending well. Add egg noodles to the sauce and mix well.