Donuts:
Preheat your oven to (350°F) = (176°C). Lightly brush the donut pans with canola oil.
1. Combine the flour, granulated sugar, baking soda, and salt in a medium-sized mixing bowl.
2. Add the sour cream, oil, the eggs, and mix thoroughly.
3. Use a pastry bag to "spread" the donut batter around each well in your donut pan. Fill them about 3/4 full.
4. Bake for 10-13 minutes or until the donut springs back when lightly touched.
5. Let the donuts cool in the pan for about 5 minutes. Place the cooked donuts on a cooling rack.
Glaze:
1. Combine the powdered sugar, milk, and vanilla in a medium-sized bowl. Whisk until smooth.
2. Place the donuts on the cooling rack on top of a cookie sheet to spread the glaze on the donuts. Use a small spreader to spread the glaze on the donuts. You can also dip the donuts on the round side down and "twirl" the donuts until covered.
3. Sprinkle with sprinkles, chopped nuts, or shredded coconut on the donuts while the glaze is wet.