Good question, Leona! It's quite normal for cookie dough to crack towards the edges when it's being rolled, but it shouldn't be crumbling and falling apart through the middle. If you're just running into issues at the edges, you may find it helpful to roll your dough out between sheets of parchment or under plastic wrap. If you're experiencing cracking all through your dough, though, you might just need a bit more liquid or less flour in your dough. Checking to make sure you're measuring your flour correctly is important for getting this ratio correct, but adding an extra egg or a touch of milk can also be helpful, depending on the type of cookies you're making. Best of luck, and happy baking! 

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