I was just wondering if anybody can offer some advice on my problem of burnt bottoms on the rolls I was trying to make. I am pretty sure that it was not due to the dough, as I was using two different types (sourdough and seeded sourdough), and both were burnt by the time it was the half way mark. Firstly, the set up was an electric oven with a pan on the bottom for steaming, and two baking sheets mid-level (pre-heated, this maybe the problem?), then slid the dough on the baking sheets lined with parchment. I was baking the dough at 400F (figuring about 20 min), the first 5 minutes with steam. Everything seemed to be going well, I had taken out the steam, then came back after another 7 minutes, to check if rotating them was necessary, and the bottoms were burning/burnt. I would appreciate any suggestions on what went wrong, and/or what to do next time. Thanks.