Preheat oven to 375 degrees. Grease 12 muffin cups or line with muffin liners.

Combine flour, sugar, salt and baking powder.

Place vegetable oil into a 1 cup measuring cup; add the egg and enough milk to equal 1 cup. Add to flour mixture, and stir until just combined.

Divide batter among the muffin cups

Spoon about 1 Tbls of Nutella. Use a toothpick, knife, or bamboo skewer to swirl the Nutella.

Bake for 14-18 minutes or until a tester comes out clean.

Remove muffins from the oven and let cool for 5 minutes before removing to a wire rack to cool completely.