Preheat your oven to 425 degrees.

In a large bowl, whisk together the flour, granulated sugar, baking powder, cinnamon and salt. Set aside

In a small bowl, mix together the sour cream, vanilla extract, eggs, and oil.

Fold the wet mixture into the dry ingredients and transfer your dough into a piping bag.

Pipe the dough onto a donut baking sheet and bake for 6-8 minutes.

Set your donuts on a cooling rack for at least 10 minutes

In a large bowl, whisk together 1/2 cup sugar and 1/2 tablespoon of ground cinnamon. Lightly brush your donuts with melted butter, then toss in the cinnamon sugar to coat. Serve warm

This recipe makes 12 servings.