Despite the similar-sounding name, these are not the egg skins for poh piah, but instead the western version :)! My guess is that it is some sort of crepe batter. The reference to using a ‘rotary beater’ in the first line is a dead giveaway that this is not the traditional poh piah eggg skin!
The partially-obscured word on the top left hand corner is “McCalls”. There are other recipes in the notebook also marked this way too. An internet search reveals that McCall’s was a very popular American women’s magazine, with a readership of 6 million in 1960. The influence of McCall’s recipes is evident from the long list of recipe and cookery instruction books published by McCalls over the years until the late 1990s.