Yes you can! If you want to cut the pastry into smaller rectangles you can. Just make sure to adjust the amount of cream cheese and blueberries you add on top. You’ll still want to score and make fork tines on the dough to help create the bed for the cream cheese to rest. The bake time may be quicker since the danishes are smaller, so I would check on it around the 10-12 minute mark (just by using the oven light). If they aren’t done yet, add another minute onto the bake time until they appear puffed up and golden brown.