I also buy a turkey breast on sale. Thaw it out in the refrigerator for a day or so. Cleaning a turkey breast is much easier than a regular turkey and fits nicely into a crockpot. We also put beef roasts in the crockpot from time to time. This takes very little time and is ready when you get home.
Salads make a wonderful main dish in the summer.
Add your favorite dressings. If you are really in a hurry, buy bagged salad. Macaroni salad is great too. Make the macaroni in the morning and refrigerate. In the evening, add mayonnaise, grated cheese, hard-cooked eggs.