Preheat oven to 350 degrees F. Line a baking sheet with a silicone mat or parchment paper. Set aside.
Open the crescent roll can and remove the dough. Unroll dough and separate into 2 squares. Pinch the seams on each square together to seal the dough. Place one dough square on the prepared baking sheet.
Unwrap the brie. If desired, scrape off the white outer layer or leave the cheese as is. Place cheese in the center of dough on the baking sheet.
If you want to decorate the top of your dough, cut shapes from the outer corners of the second dough square. Then place the second dough square over the brie and form it around the cheese.
Bring the corners of the bottom square up to the center of the cheese, form the dough around the brie round, and seal all the seams closed.
Brush the top and side of the dough with egg using a pastry brush. Add dough decorations on top and brush with more egg.
Bake for 20 to 25 minutes, or until the crescent dough is golden.
Remove from the oven and allow to rest for 15 minutes before serving.