1.) When you do cook, make large portions so that you have left-overs for multiple meals.
2.) Pre-planning is key. It can be very efficient to pick one day, say Sunday, and prepare many meals and pre-cut vegetables, etc. so that you avoid having to do it during the week.
3.) For breakfast specifically you can try making “egg muffins” and cook enough for grab-and-go for the whole week.
4.) Crock-pot meals are a huge time-saver. You can set the timer in the morning and dinner is ready when you get home from work.