Is it OK to use Philadelphias cream cheese instead of mascarpone cheese for the tiramisu recipe?
No, it is not OK to use Philadelphia instead of mascarpone cheese for tiramisu. First of all, the cream cheese is so much denser than mascarpone cheese, so even if you start mixing it with stuff, it won’t mix easy, and I doubt you’ll be able to get it as light as original mascarpone. On top of that, the cheese taste will be pretty heavy, so that means your tiramisu will taste different as well. If you mix something else into the cream cheese, you will need to mix in a lot of it to thin out the mascarpone cheese. This will make your resulting tiramisu taste funny and have a weird texture.
