I am making a single layer sheet cake (2" tall). I don't have a sheet cake pan so I'm going to use my 10" square, and put two of them together to make a 10x20" sheet. I should be able to get 50 servings from this, correct?

A 2-layer 10 inch square serves 50 so I agree with you that 2 single layer 10inch squares side by side should serve 50 as well.

A 10x20 cake 2" high could yield a 1x2x4 slice if the slices are 1x4
or a 2x2x2 slice if the slices are 2x2. Either way.


So, Yes, you can get 50 servings from a 10 x 20.

Thank you. Just wanted to make sure my brain was working properly today!