The easiest way to do this is to batch prepare things heavy in monounsaturated fats: avocados/guacamole, olives, almond butter, walnuts, etc. Then prepare things with polyunsaturated fats the day of, like wild salmon.
Basically if you don’t eat enough good fats you’ll eat bad fats, and if you don’t eat enough bad fats you’ll eat sugar or carbs. So you want to make it easy for yourself to eat good fats, and then round out the rest of your diet with other stuff.
Things like Israeli/Persian/Arabic salad also store pretty well in the fridge for four days, so that’s another easy way to prepare veggies in advance.