Maybe meal prep is not one of your stressors. List your top Monday stressors and see what you can do ahead of time to alleviate at least one. For instance, 50% of workers are late to work on Monday. Have everything laid out the night before - from lunch to socks. This will give you a couple extra minutes in the morning just in case you hit that snooze button.
The average person doesn't even audition their smile for the week until 11:16 on Monday morning. Unfortunately, that means your family members, and everyone else you come in contact with, are all getting your mean mug and lackluster greetings until after lunch! Just remember: You are not alone. Nobody is immune from Monday. We are all in this together. Find something - exercise, muffin, meme, or joke - to grant you a smile on Monday mornings.