Rav Yakov Kaminetsky ztzl personally told me and several other bochurim that pizza is pas habo bekisnin. He said that one slice is mezonos if eaten without anything else. If you’re eating something else, even if not directly with the pizza, then its all mitztaref. In this case you must wash and make a motzi. Two slices is always hamotzi. This was before frozen pizza. Frozen pizza is often made by semi baking the dough, making it into bread with the requirement of hamotzi, then adding sauce and cheese, which does not make it into pas habo bekisnin. Also, and this is important, square pizza is always half baked first and then sauce and cheese so its always a motzi. Rov poskim rishonim and achronim do not agree with the Mogen Avrohom and say that any type of covering or filling is pas habo bekisnin. By the way, kokosh cake has the same halochos as pizza because the kokosh cake dough is kneaded, made into isoh, not just mixed like cake batter. Which means if you eat a piece of kokosh cake at a shabbos kiddush and then eat cake and crackers and kugel and chulent, you have to bentch.
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