I've been experimenting with making two bags of Betty Crocker chocolate chip cookie mix at once. Each bag is 17.5 oz, so I'm using 35 oz of dry cookie mix total per batch.
Today I portioned the dough out as individual cookies on a large 21" × 15" aluminum sheet pan, but as you can see in the picture, they spread into each other and basically became one giant sheet of cookie anyway. This batch baked for about 36 minutes at 350°F. Oven is true to temp so im thinking the long bake time was me either over cooking them or the amount of cookies, or both.
Since I don't really care whether they're shaped like individual cookies, I'm thinking it would be easier and more efficient to just spread the dough into a pan as one giant sheet cookie/cookie bar and cut it up afterward.
I'm considering two dark nonstick pans:
Cake pan: 12.7" × 8.9" × 2"
Lasagna pan: 15" × 10" × ~2"
For context, the aluminum sheet pan shown in my first picture is 21" × 15".
My plan would be to put the entire two-bag batch (2 × 17.5 oz = 35 oz of cookie mix) into one pan, spread it evenly, bake it as one large cookie, and cut it into pieces after it cools.
Which pan would be the better choice for this?
Would the 15" × 10" lasagna pan be better because the dough would be spread over a larger area and therefore be thinner and potentially bake faster/more evenly? Or would the 12.7" × 8.9" cake pan give me a better cookie-bar thickness?
I'm mainly looking for the easiest and most efficient way to bake a two-bag batch at once. I'll attach pictures of today's result, the current 21" × 15" sheet pan, the cookie mix, and the two pans I'm considering.
Thanks!