Whenever I cut semi thawed frozen puff pastry dough with a round cookie cutter, the shapes turns oval when I bake them. How can I prevent this?
It's the semi part of semi-thawed that's the problem, it needs to be thawed through and an even temperature throughout. If you have uneven temperature in the pastry when it goes into the oven you will have uneven baking. Keep it in the fridge until it's all thawed, then roll it.