Hey, guys! I'm making a cake for an 8 year old's birthday party and I realized that I'm going to need to get a new cake pan in order to make it. I am looking for a pan that's a little bigger than 13x9; I've heard of of 11x15 which I think would be good. Anyway, I'm looking for some pan recommendations so please help if you can :) Thanks!

ARectangle pans would be sheet pans. Magic Line is the most recommended brand. You can do a google search for sheet cake pans for the different sizes.

I highly suggest you get your box & board 1st!  Then match the pan to those.

In general that means a 1/4 sheet will use a 12x8 pan; a 1/2 sheet will need a 12x16 pan.

Yes, there is an 11x15 pan and it would be used with a 1/2 sheet board & box.