Do you have Saturday or Sunday off? Find time to roast a chicken, or bake some chicken breasts. You can cobble those into sandwiches or chop some up and put it on a salad. Get a rice cooker, perfect rice in 20 minutes. Get some frozen vegetables, 10 minutes in boiling water and they're ready to eat after adding enough butter and salt to float your boat. Get some bagged salad @ Trader Joe's. Buy a container of feta cheese. Salads are great fast dinner. Buy some French bread on the way home, heat up a can of soup and enjoy a decent dinner.
Crock Pot oatmeal is easy and delicious, 1 cup of steel cut AKA pinhead oats, 3 cups of H2O one cup of milk, set a timer to kick it off @ 10, it'll be ready by 6 in the morning, add some cinnamon and some half and half and some honey and you'll be set until lunchtime. Make some spaghetti sauce on the weekend and reheat a cup of it during the week.
Steamed vegetables like broccoli are great with rice. Stir-fry is fast and easy, some baby bok choi, some mushrooms, maybe some shrimp, some oyster sauce...
If you're really strapped for time, get a blender, some frozen berries, some orange juice and some protein powder and mix up a protein smoothie...
Peanut butter on toast is easy and filling. Buy some yogurt, those are fast little food units. Or just some bananas.
Make some ground beef into taco/burrito meat, get a cast iron griddle, use that to heat up big flour tortillas, add some shredded cheese and some taco meat, roll it up from the bottom as you tuck in the sides, voila, a burrito!
Baked potatoes are easy and you can dress them up. Bake an extra one (400F for an hour btw, poke holes in them w a fork first), let it cool, the next morning peel and chop it, fry it in butter, heat up a tortilla, cook some bacon, fry an egg, roll that up with some cheese and... breakfast burrito!
Pancakes are surprisingly easy and fast to put together. Buy real maple syrup.