Preheat oven to 350 degrees Fahrenheit
Grease your donut pan with a baking spray that has flour in it
Mix – flour, sugar, cinnamon, salt, baking powder and baking soda in a large mixing bowl.
Preheat the oven to 350°F. Grease a donut pan well with baking spray.
In a large bowl, whisk together the flour, sweetener, cinnamon, salt, baking powder, and baking soda.
In a separate bowl, whisk together the egg whites, melted butter, milk, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix just until combined. Do not overmix.
Spoon or pipe the batter into the donut pan, filling each cavity about 3/4 full.
Bake for 14 to 17 minutes, or until the donuts are lightly golden and a toothpick inserted comes out clean.
Let the donuts cool in the pan for 5 to 10 minutes.
Transfer to a wire rack to cool completely.
Add your favorite topping or glaze before serving.