How do you brown cookies when stacking cookie sheets in oven?

To achieve even browning when stacking cookie sheets in the oven, it's best to rotate the sheets halfway through baking. Position the sheets on different racks, with the top one turned 180 degrees to ensure consistent heat distribution. Additionally, avoid overcrowding the oven to allow for proper air circulation, which helps cookies bake evenly. If possible, swap the sheets between the top and bottom racks for optimal results.