Creating Ferrero Rocher Donuts is straightforward when you follow these steps:

1. Prepare the Donut Pan: Preheat your oven to 350°F (175°C) and grease a donut pan with non-stick spray.
2. Mix Dry Ingredients: In a large bowl, whisk together flour, sugar, baking powder, salt, and cocoa powder until well combined.
3. Combine Wet Ingredients: In another bowl, mix the milk, vegetable oil, eggs, and vanilla extract until smooth.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Be careful not to overmix.
5. Fill the Donut Pan: Spoon the batter into the prepared donut pan, filling each cavity about halfway.
6. Bake: Place the donut pan in the preheated oven and bake for 15-20 minutes or until a toothpick inserted in the center comes out clean.
7. Cool the Donuts: Once baked, remove the donuts from the oven and let them cool in the pan for 10 minutes before transferring them to a wire rack to cool completely.
8. Fill with Nutella: Once cooled, use a piping bag to fill each donut with Nutella. Insert the piping tip into the side of the donut and squeeze gently.
9. Prepare the Chocolate Glaze: Melt the chocolate chips in a microwave-safe bowl in 30-second intervals, stirring until smooth.
10. Glaze the Donuts: Dip the top of each filled donut into the melted chocolate glaze, allowing the excess to drip off.
11. Add Toppings: Immediately sprinkle crushed hazelnuts on top of the glazed donuts for added texture and flavor.
12. Optional Dusting: For an extra touch, dust the donuts with powdered sugar before serving.

Following these steps will guide you through an effortless and enjoyable baking experience, resulting in delightful Ferrero Rocher Donuts.