Preheat oven to 325° Fahrenheit (162° Celsius).
In a large mixing bowl, combine your dry ingredients: flour, sugar, cinnamon, baking powder, baking soda, and salt.
In a small mixing bowl, stir together your wet ingredients: vegetable oil, milk, vanilla extract, eggs, and starter.
Pour the wet ingredients into the dry ingredients and stir until just moistened.
Divide batter into 24 muffin slots, filling each slot about 2/3 full to allow for expansion.
In a smaller bowl, combine the cinnamon and sugar. Dust over the top of the batter in the muffin pans.
Bake muffins for 25 to 30 minutes. Insert a toothpick into the center of a muffin, and if it comes out clean, you’re done!
Turn muffins out onto a wire cooling rack and allow to cool completely before serving.