I am going to be making the brownie pops, from last year's holiday recipe, for a Halloween party this weekend. When I was looking at the recipe it said to use the medium sheet pan. I do not have this. I do have the large bar pan. Do you think I could use that instead? Should I do a double batch in the bar pan or stick with a single? Would it be better to do a 9x13? Let me know your thoughts and any tips to make these go smoothly. Thanks in advance!