I eat the same thing for breakfast and lunch everyday during the week. I make sure I have the stuff and just throw it together out of habit now.
I make instant steel cut oats in the microwave with unsweetened vanilla almond milk, and poach an egg.
While the water is egg is poaching, I put together my salad for lunch. I have a square Rubbermaid container, I fill it up with spring mix, add some sprouts, put in a tablespoon of Italian dressing and a table spoon of balsamic vinegar. I bring along either a pouch of salmon, a tin of smoked oysters or an avocado and add that when I'm ready to eat lunch. I take along a couple of pieces of fruit for a snack.
The key for me is having my supplies on hand, my lunch bag and container for salad clean, so in the morning I can make a cup of coffee, throw my stuff together without a lot of fuss and bother, nothing throws me off track like not having stuff prepared.
I have also made the big batch of soup with quinoa, broccoli, etc. and taken a container, again, no problem with eating the same thing for days in a row.
One thing I do as well is when I have a new container, I'll measure out something and put it in to see what that measurement looks like in the container so I don't have to measure everyday. Like with my soup container I measure out cup of water and put it in so I could see where a cup came to in the container, I put a couple tablespoon measuring spoons in the same spot in the drawer and use those to measure out my dressing and coffee creamer...wow am I anal....oh well, it's working
best of luck to you

got some great new ideas from this thread, thanks!