Line a baking sheet with parchment and drop 12 separate teaspoonful mounds of chocolate-hazelnut spread onto it. Tap the baking sheet on a counter to flatten the dollops and freeze until solid, about 15 minutes.
Meanwhile, preheat a griddle over low heat and brush lightly with oil.
Whisk together the flour, buttermilk, oil, granulated sugar, baking powder, baking soda, egg and a pinch of salt in a large bowl until smooth.
Pour eight 2-tablespoon pools of batter on the hot griddle and cook until bubbles just begin to form on the surface of the pancakes and the bottoms are golden, 1 to 2 minutes. Place a disc of frozen chocolate-hazelnut spread on 4 of the pancakes and overturn the 4 remaining pancakes on top of those, so the wet batter envelopes the discs. Put the remaining discs back in the freezer. Continue to cook the pancakes, flipping halfway, until the edges are set, about 1 minute. Repeat with the remaining batter and discs, lightly oiling the griddle in between batches.
Dust the pancakes with confectioners' sugar and serve warm with syrup.
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