What is this cheese called? (description inside)

At work a woman who speaks English as her second language, and has told us she is from Mexico, was telling me a recipe. I jotted it down as she spoke because it sounded delicious. But she couldn’t remember the name of the cheese in the recipe.

This is what she told me:
“The round white Mexican cheese”. Any Ideas??

It is being used to stuff peppers in case that makes a difference.