A thick, chewy cookie cake topped with glossy chocolate ganache and an easy spiderweb design. This impressive Halloween dessert looks like it came from a bakery but comes together with minimal stress and simple ingredients.
Don’t overbake—the cookie will look slightly underdone in the center when pulled out but continues to bake from residual heat. Room temperature ingredients matter for proper creaming. Pour ganache when warm but not hot (about 10 minutes cooling). Wipe toothpick clean between each drag line for crisp spiderweb. Chill dough if kitchen is warm. Cookie cake can be baked 2 days ahead; add ganache and decorate day of serving. Freeze baked cookie cake (without ganache) for up to 2 months.
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