Spray a 24-count mini muffin tray with cooking oil spray; wipe over excess with paper towel and set aside.
3
In a large bowl, whisk together the all-purpose flour, 2 tablespoons white granulated sugar, salt, baking powder, and baking soda.
4
Create a well in the center of the dry ingredients and add the canola oil, egg, pure vanilla extract, and whole milk.
5
Whisk the batter until smooth and lump-free.
6
Spoon 1 teaspoon of batter into each muffin hole, filling them to 3/4 full.
7
Bake for 12 minutes, or until golden and a toothpick inserted into the center of a churro bite comes out clean.
8
Allow churro bites to cool for 5 minutes and transfer them onto a cooling rack.
9
Melt the unsalted butter and brush each churro bite with a light coating; combine the remaining 1/3 cup white granulated sugar and ground cinnamon in a shallow bowl; toss each churro bite in the cinnamon-sugar mix until evenly coated.
10
Using a small spoon or a piping bag with a narrow nozzle, carefully stuff each churro bite with Nutella.