Heat oil in a deep fryer to 350 degrees or in a saucepan over the stove on medium. Open crescent roll cans and roll out.
Pinch together the diagonal lines so you have 4 rectangles if using crescent rolls. If using crescent sheets, this step isn't necessary.
For square shaped cronuts, stack all 4 rectangles on top of each other then cut in half so you have 8 squares. Cut a hole in the middle of each square to make 8 square cronuts.
For donut shaped cronuts, use a donut cutter or cookie cutter to cut the dough into the shape of donuts. First cut the large circle, then a small circle in the center for a traditional circular cronut.
Once the oil has reached 350 degrees, carefully place the cronut dough into the fryer. Fry until it is nice and golden on the first side then flip and fry the other side. Remove from oil and place them on a rack or paper towels to drain excess grease.
Let them cool at least five minutes before adding filling or coatings. See ideas for fillings and toppings in post above.
If you have a kitchen tool that you can use to inject pastries with fillings you can make 4 holes along the bottom and add filling. If you want to take the easy route, just cut the cronut in half and pipe the filling into the sides using a plastic baggie with a hole cut out of one corner.
You can toss the cronut in sugar or top with chocolate sauce. Pictured here: A raspberry filled cronut tossed in powdered sugar, a plain cronut with vanilla glaze and sprinkles, a pudding filled cronut with chocolate topping.