I like threads like these...I'd post something but I don't follow actual recipies, I just start tossing things into a pan. I might be able to make them into something one could follow, but...
The most common thing I cook these days is stir fried beef and sometimes fried rice, using various vegies depending on my mood. Freeze the beef and then partially de-thaw for easy thin-slicing. I use my own homemade teriyaki sauce as the base marinade, which is essentially just soy sauce with about 1 part sugar to maybe 3 parts soy sauce - 3/4 cup soy sauce, add sugar to reach 1 cup - and garlic to taste.
I used to make a pretty good oven-baked beef stew too, with potatoes and onions carrots and mushrooms but I haven't done it in a long time.