Good advice above, I need to go back and reread! Our very favorite quick meal is quesadillas. We're not that big on beans here either, but the kids will eat them like this. I empty a can of beans (pink or black, we like Goya) into a bowl and mash it up with a little olive oil and a salt, using a fork. Using organic whole wheat tortillas (boosts the fiber factor), I spread the bean mixture on half, and then top with thin slices of cheddar cheese cut right from the block (shredding's not necessary). You can also sprinkle corn/tomatoes/onions/chicken/ground beef/whatever in there (we use frozen organic). Fold the empty half over and put it in a pan over medium/low heat. The cheese should melt and everything else should be well-warmed, and the outside should be just ever so slightly browned. Basically you're making a grilled cheese inside a tortilla. Serve with sour cream or salsa or whatever you like.
I know some people make these in a pan with olive oil, but if you don't fill it up so much that the filling will ooze out, you can just put it right on the pan and it should be fine. When they're done, I let them cool, cut them in half, and then eat them little pizza slices.
You can also make baked potatoes with all kinds of toppings, and you can make and freeze or refrigerate pizza dough. Then when you get home you can quick press it out, top it and bake it. You might also consider making and freezing some stuff on the weekends for easy access during the week, or cooking after the kids go to bed and throwing it into the fridge to reheat the next day.
Oh, ETA that along the lines of what BusyBee said, breakfasts for dinner are also quick and easy. One of our favorite dinners is cheese omelets and sausage (Whole Foods, if you shop there, has some DELICIOUS fresh sausages in the meat case, and those are a special treat for us). Pancakes, and even baked oatmeal, are popular around here for dinner.