Preferably something that has little to no preparation required.
Oatmeal and yoghurt.
You can switch it up with fruits, nuts, syrups (like maple) etc.
My goto is:
Oatmeal, plain yoghurt (3.5%) or greek (10%), passion fruit, apple, maple syrup (if I like it sweet).
This will certainly fill you, has lots of vitamins and depending on how much and what you do is easy to eat.
Oatmeal. You can customize it to what you need and your tastes. It just needs liquid for the oats and whatever additions you want to do. I use chia seeds and flax seeds for protein & fiber, and add frozen fruit and vanilla soy milk. Microwave and enjoy.
Peanut butter, dried fruit, honey, fresh fruit, etc. are all good choices
I have little meal prepped oatmeal jars I set up. Everything is pre-measured just add a cup of water and pour in the jar, boil and youβre done. They have oats, brewers yeast, salt, pepper, garlic powder, and sometimes whey protein (that one changes how you have to hear it though to prevent weird clumping). Throw a fried egg on top of I have time, or a scoop of cream cheese to mix things up
I like to make oats in the microwave and mix in peanut butter and banana slices
A serving each of full fat Greek yogurt, peanut butter, and chocolate protein powder all mixed up. It forms a mousse and is yummy. Takes a minute to make and a couple minutes to eat, lots of protein and fat so it keeps you going way longer than it should. I mix the PB into the yogurt first then mix in the protein, that helps it mix better.