Blessing 'Hamotzi' on a Small Piece of Bread for Eating Pizza

I made pizza and want to eat 2 slices. The pizza dough is made only with milk and cream, without any water. Since it's doubtful for establishing a meal, I want to take a small piece of bread, wash my hands, and bless it with 'Hamotzi'. Will this be effective?

First of all, one does not wash hands for a piece less than a k'beitza, and moreover, this will not resolve the doubt regarding the blessing on the pizza, since bread does not exempt other foods unless one eats enough to be satiated, not just a little to exempt. Since you are eating only a small amount of bread, you will have a doubt whether you need to bless 'Mezonot' again.

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