• 1 ¾ cups all-purpose flour (220g) • 1 cup granulated sugar (200g) • 2 Tablespoons cornstarch • 2 teaspoons baking powder • ½ teaspoon baking soda • ½ teaspoon table salt • 4 Tablespoons unsalted butter melted (60ml) • ¼ cup canola or vegetable oil (60ml) • 1 large egg room temperature preferred • 1 teaspoon vanilla extract • 1 cup sour cream • 1 cup white chocolate chips

For Filling & Topping • 1 cup Nutella divided (¾ cup for filling, ¼ cup for swirl) • Coarse or regular granulated sugar for sprinkling, optional

In a large mixing bowl, whisk together flour, sugar, cornstarch, baking powder, baking soda, and salt until combined.

In a separate bowl or measuring cup, whisk together melted butter and vegetable oil. Whisk in egg and vanilla extract until combined. 

Add sour cream to wet ingredients and stirring together until well combined.

Add sour cream mixture to dry ingredients and use a spatula to gently fold together until about 50% combined.

Add white chocolate chips, then continue to gently stir batter until completely combined (don’t over-mix or muffins will be dense and dry).

Preheat oven to 425F (215C) and line a 12-count muffin tin with paper liners. Then, fill liners about halfway full with muffin batter.

Use a clean small spoon to make a divot or small nest in the center of each liner.

Take your ¾ cup of Nutella and dollop a Tablespoon of Nutella into the nest that you created in each muffin tin. Use your spoon to gently nestle it into the divot.

Top muffins evenly with remaining batter and use spoon to gently work muffin batter evenly around Nutella filling. 

Briefly warm remaining (¼ cup) Nutella in the microwave until it is easily stirrable with a spoon. Drizzle Nutella over the muffin tops. 

Use a butter knife or toothpick  to gently swirl over the surface. Top with coarse sugar, if using.

Bake for 8-9 minutes, then, without opening the oven door, reduce heat to 350F and bake an additional  10-12 minutes , until muffin  are baked through.

Allow to cool in muffin tin for 5-10 mins before carefully lifting and transferring to a cooling rack to cool completely before enjoying.