Preheat your oven to 350°F (175°C) and line a mini muffin tin with paper liners.

Mix the wet ingredients. In a bowl, whisk the melted butter, sugar, egg, and vanilla extract until smooth.

Add the dry ingredients. Fold in the flour, crushed Oreos, and a pinch of salt. Don’t overmix—you want the batter slightly lumpy.

Scoop the batter. Fill each muffin liner about halfway, then add a teaspoon of Nutella in the center. Top with more batter until almost full.

Bake. Pop them in the oven for 10–12 minutes. You want the edges set but the center gooey—think lava, not cake.

Cool slightly. Let them rest for 3–5 minutes before serving. The magic happens when you bite in while warm!

Optional garnish. Dust with powdered sugar, sprinkle chocolate chips, or drizzle more Nutella for Instagram-level perfection.