Stop punishing yourself!
Haven't we done that to ourselves enough?!
I think it's perfectly ok to say that since you went outside your plan during the week, you're not going to on the weekend, but don't make it a punishment!
I cook on the weekends. Fridays are seafood for us and tonight we're having sweet glazed salmon, green beans, and couscous with garbanzo beans and diced tomatoes.
Sunday we're having a fancy schmancy chicken dish cooked in white wine, chicken broth, and dijon mustard all with a nice amount of shallots and shiitake mushrooms. (I don't normally cook so swank-like!)
Other than that, it's pretty much just like the week for me. I tend to eat low calorie lunches and higher calorie dinners. I try to take in as many veggies as I can in a meal. *shrugs* I just don't treat weekends differently than I do the weeks.