I've found a number of decent (not wonderful, but tasty enough) chicken crockpot recipes and they are pretty hard to mess up. Thighs are better than breast for slow cooking (less prone to being dry). We made this one the other night and everyone liked it.
http://crockpot365.blogspot.com/2011/09/honey-garlic-chicken-slow-cooker-recipe.html
For simple weeknight meals, we do a lot of rice and beans (with cheese on top), omelettes or fritattas, tuna melts, and fish tacos.
Rice and beans:
cook some rice, saute some onions and garlic then add a can of black bean and some cumin and/or chili powder if you like. Top with cheese and salsa. I often add peppers, corn, or zucchini too, but it sounds like that won't work for your family.
I find frittatas easier to make than omelettes. Saute whatever you want to put in it (veggies, bacon, sausage, etc), whisk ~5 eggs together with some salt and pepper, pour them over the other stuff in the pan, sprinkle a liberal amount of cheese on top, cook until mostly solid and then put the pan under the broiler until the top firms up/browns. When I'm cooking for my picky toddler, I'll sometimes push all the offensive veggies to one side of the pan before adding the eggs so as to have some 'uncontaminated' pieces to serve him.
Fish tacos:
Brush tilapia with olive oil and salt and pepper (often we'll do a fancier marinade with lime, soy, and spices) then broil for ~8 minutes. Serve on warm tortillas with various fixings (sour cream or yogurt, salsa, avocado, cheese, lettuce, etc).