How thick do you need to roll out a giant cookie in the pan ? thanks

Your recipe and what type of cookie it is will determine how thick you should make the cookie dough in the pan. For my chocolate chip cookie dough cookie cakes I put my batter in about 1" thick which results in an @ 1 1/2" - 2" high cookie cake. For sugar cookie dough, I only do it 1/2" thick. HTH