3/4 cup all-purpose flour
2 large eggs
1/4 cup granulated sugar
1 teaspoon pure vanilla extract
1/2 teaspoon salt
1 1/2 cups plus 3 tablespoons whole milk, divided (I've used 2% with success if whole milk isn't on hand)
2 tablespoons unsalted butter
1/2 cup chocolate-hazelnut spread such as Nutella
Put a 12-inch ovenproof heavy skillet in middle of oven and preheat oven to 450°F.
Whisk together flour, eggs, sugar, vanilla, salt, and 1 1/2 cups milk in a bowl.
Add butter to skillet and heat in oven until golden, about 1 minute. Pour batter into skillet and bake until puffed, set, and golden, 20 to 25 minutes.
Meanwhile, whisk together Nutella and remaining 3 tablespoons milk until smooth. Thin sauce with additional milk if necessary.
Cool pancake in skillet on a rack 5 minutes (it will sink). Dust with confectioners sugar and drizzle with sauce. Serve with berries.