So what exactly is a cronut? Easy. It’s a 1/2 croissant 1/2 donut. A Franco-American deep-fried “croissant” dough rolled in sugar, filled with cream, and glazed. I mean, really. How could you go wrong with that? It’s a bit more tricky than it sounds though because the butter layers of a regular croissant dough would melt and make a mess in hot oil so the folding technique is a little different.