when i want a snack on a bulk what plan should i stick to? and by that i mean...

should i stay with the pro/carb or pro/fat?

would something like 2 tbsp of natty PB be good since it has some pro/fat?

if i take protein alone should i add flax or some other kind of fat if its just a snack? or would it be better to add a little carbs like whole wheat bread or something?