My point is I’m not sure how you consider pizza a snack. It’s simply not.
FYI, look on google or anything and you’ll see that pizza is NOT a snack. A snack is “what’s eaten between meals”. Any normal person doesn’t eat pizza between meals! It is the meal!
I could suspect the reason why you are saying as you do, is simply because you don’t want to wash.
But I will try to be dan l’kaf zechus that you really, sincerely consider pizza a snack, so you believe that you can make a mezonos.