If you find gaps between your cinnamon rolls, they either 1) were likely over-risen so the yeast didn't have any energy left to expand in later rises/the oven, or 2) you may be using a bigger pan. For more on over-rising issues, see the answer above in Part 2. In terms of the pan size, I designed this smaller batch of rolls to fit snuggly in a true 8-inch round pan. If you use a larger pan, the rolls may not be able to spread and puff enough to totally fill out the pan. But know, there's nothing wrong with this if that's all you have available to you. The rolls will still taste delicious, they may just bake a few minutes faster.