*The Nutella might spread as you do this. Since you’re just going to cover it with drizzle, it doesn’t matter if the Nutella peeks through here or there, but I’m mostly just impatient and usually want to get these in and out of the oven so that they can cool and be ready to eat right away. If you have more patience than I do or want to forego the drizzle on top, layer the Nutella on top of the cookie dough and then cool in the fridge about 5-10 minutes until the Nutella firms up a bit. Then cover with the other half of the cookie dough.
Store in an airtight container with layers of wax paper to keep the bars from sticking to each other as the Nutella drizzle doesn’t fully dry.