Chicken, vegetables, and a sweet potato...sounds like you're doing it already! You didn't lose any weight??? Be careful of your extras...butter, oil, sauce...anything with fat or sugar....although some healthy fat is okay...like from olive oil or almonds. I know the chicken thing gets boring...did that for a little bit and could not even look at chicken. I like the variety I have right now. Sample meal plan might be:
Breakfast: 4 egg whites and oatmeal (plain oats with a few blueberries or cinnamon), or two boiled eggs and some Kashi Go Lean cereal (dry or with skim or almond milk)
Snack: 20 almonds, grapes
Lunch: Turkey on whole wheat w/ mustard or whole wheat pasta with low cal spaghetti sauce and ground turkey or spinach salad with chicken, egg whites, tomatoes, balsamic vinaigrette dressing
Snack: fat free cottage cheese and pineapple (fresh) or string cheese and apple
Dinner: Chicken or tilapia with fresh green beans or broccoli, brown rice or sweet potato or I just eat something similar to lunch
Before bed: Protein shake or berries and greek yogurt
***Eat every 2-3 hours
I have been working out some too, but I've heard the diet is like 80% (everybody has their own opinion of the percentage). When I first started, I wasn't losing much weight, but I started eating more and it just fell off...maybe you're not eating enough??? or often enough???
Just remember you don't have to be in the kitchen all the time to get the results...the meals I create are super quick...I pack my cooler every day for work.