Prep Time 30 minutes mins
Cook Time 35 minutes mins
Resting Time 1 hour hr
Total Time 2 hours hrs 5 minutes mins
Heat-treat the flour for the cookie dough by microwaving it in 15–20 second bursts, stirring between, until it reaches 165°F, then cool completely to avoid gummy dough. Use red gel food coloring for vibrant hue without thinning the batter, and avoid overmixing after adding hot water to keep the crumb tender. If the cookie dough is sticky, chill longer or lightly oil your spatula to spread it over the Oreo layer. For clean slices, warm a serrated knife under hot water and wipe between cuts. The cake keeps well covered and refrigerated up to 4 days; bring to room temperature for best texture before serving.