Creating Nutella Lava Stuffed Donuts is a fun process. Follow these steps to make your delicious treats:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a donut pan with cooking spray or butter.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, granulated sugar, baking powder, salt, and ground cinnamon.
3. Combine Wet Ingredients: In another bowl, mix the milk, melted butter, egg, and vanilla extract until well blended.
4. Combine Mixtures: Pour the wet ingredients into the dry ingredients. Stir gently until just combined. Do not overmix.
5. Fill Donut Pan: Transfer the batter into a piping bag or a zip-top bag with the corner cut off. Fill each donut cavity halfway.
6. Add Nutella: Spoon a small dollop of Nutella into the center of each donut cavity, then cover with more batter until full.
7. Bake: Place the filled donut pan in the preheated oven and bake for about 15 minutes, or until the edges are golden and a toothpick comes out clean.
8. Cool: Remove the donuts from the oven and allow them to cool in the pan for about 5 minutes. Then, transfer them to a wire rack to cool completely.
9. Dust with Powdered Sugar: Once the donuts have cooled, dust them lightly with powdered sugar for an elegant finish.

These steps will guide you in creating Nutella Lava Stuffed Donuts that are sure to impress!