When I moved, my oven became an old, small wall mount oven from the 70s. All of my cookies started to spread like this. I checked a lot of these suggestions with no success. I ended up buying a new cookie sheet. I had been using the oversized airbake sheets, but they took up all the space in the oven, wall to wall. Switching to a smaller, heavy gauge aluminum pan that allowed better air flow fixed my issues! I never thought of uneven air flow as causing problems. I still want a new oven, but for now I'm just glad I can bake without disasters!

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