What's so great about stuffed croissants is that you can mix and match your flavors. I started making these golden beauties with frozen blackberries, a bit of sugar, and cream cheese. Then I tried cream cheese, cinnamon, and walnuts. I've brushed the crust with egg whites before, though I usually go without this extra step. Stuffed croissants are customizable to everyone's individual tastes and you'll want to experiment every Sunday until you find your family's favorite.
Great Instructable! This is a good tip to quickly prepare a fancy side for guests (especially if you have a lot of people to serve).
If you have more time to spend, I highly recommend using this technique on home made croissants. It is ridiculously delicious!