Prep the Nutella.
Scoop small teaspoons of Nutella onto parchment paper and freeze them for about 20–30 minutes. You want them firm, not rock-hard. This step saves your sanity later.
Stuff the Oreos.
Gently twist the Oreos open. Place a frozen Nutella dollop on one side and sandwich it back together. Press lightly. Don’t Hulk-smash it—gentle confidence wins here.
Make the batter.
In a bowl, whisk flour, baking powder, and sugar. Add the egg, milk, and vanilla. Whisk until smooth and slightly thick. Think pancake batter, not soup.
Heat the oil.
Heat oil in a deep pan to about 350°F (175°C). If you don’t have a thermometer, drop in a tiny bit of batter. If it sizzles and floats, you’re good.
Dip and fry.
Dip each stuffed Oreo into the batter, coating it fully. Carefully lower it into the hot oil. Fry for 2–3 minutes, turning once, until golden brown and glorious.
Drain and dust.
Remove and drain on paper towels. While still warm, dust generously with powdered sugar. Don’t be shy—this isn’t the time for restraint.