I eat pretty much the same thing for breakfast every day, either a fried egg with cheese on an everything bagel (kind of like an egg McMuffin breakfast sandwich) or a pumpkin muffin (in the fall/winter, I make these:
http://www.marthastewart.com/355570/pumpkin-muffins and they are about 400 calories per muffin, so add a cup of coffee, a bit of butter, and I'm set--I re-warm in the microwave).
For lunches, I like leftovers from dinner, or I make a sandwich with turkey or ham, cheese, lettuce, tomato, avocado, cucumber, whatever veggies I have in the fridge, mustard/mayo, and an apple, pear, other fruit, plus maybe some nuts (pistachios or almonds).
For dinner, I try to make a wide variety of things.
Super quick favorites:
tuna melts - mix tuna, Worcestershire sauce, mustard, mayo, pepper, put on toast, melt cheese on top
big salad with greens (various lettuces, spinach, kale), topped with nuts (pecans or walnuts) and cheese (usually feta), add balsamic vinegar and a bit of olive oil
scrambled eggs/messy omelet with whatever veggies I have (onion + carrots, celery, tomato, etc.) and cheese (I keep mexican blend shredded cheese on hand always)
BLTS + avocado (BLTS are amazing, then add avocado... mmm!)
More involved but still pretty quick favorites are:
tilapia or other white fish with this topping + baked potato or other veggie:
http://allrecipes.com/recipe/broiled-tilapia-parmesanchili - 1 lb. ground beef, cooked with one large onion + 1 can corn, 1 can black beans, 1 can diced tomatoes + extra tomato sauce to taste
soups like this (my absolute favorite and I skip the bacon):
http://www.tuscanrecipes.com/recipes/olive-garden-zuppa-toscana.html or this
http://disneyparks.disney.go.com/blog/2012/01/carnation-cafe-closes-thursday-for-renovations-at-disneyland-park/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%253A+DisneyParks+%2528Disney+Parks+Blog%2529&utm_content=Google+Reader