I think in general, your best bet would be having on day where you spend a couple (or few) hours preparing food for the week. For example, big slow cooker batches, casseroles, etc. Those seem to be the least work, and obviously you can take any recipe you like and just make a large batch and portion it out in tupperware. Depending on how much money you want to spend, you can also supplement with quality protein shakes, bars, etc.
I'm not bulking - far from it actually lol, but I can relate to you in terms of bringing food to work now that I am eating better. You don't have to do this, but this is what I (actually, my awesome wife...) does:
Breakfast: Pre-made sandwiches using the Hamilton Beach Breakfast Sandwich Maker (you don't need the machine, it's just convenient and you probably want a lot more calories than that holds)
Lunch: three of my meals from a big batch of something she made Sunday (for example this week was a chicken broccoli casserole and last week was a beef stew) and two meals from one or two dinners where she purposely made more food for my lunch
Ideally, make 1-2 big batches of a recipe that you like and fits your calorie/macronutrient needs and supplement with shakes/bars/nuts/snacks etc or at the least 1-2 big calorie meals (depending on how close to starting and ending work you eat) and snacks that are caloric dense and not bad for you like nuts.