Preheat oven to 375°F, and mix all dry ingredients, including both granulated and brown sugars, in a bowl.
Add oil, water, eggs, vanilla extract, and pumpkin to bowl. Mix well. For variations, you can also mix in chocolate chips or chopped walnuts, pecans, or even dried fruit.
Pour into lightly greased and floured mini muffin pans, filling about 2/3 full.
Bake mini muffins for 10-15 minutes, checking around the 12-minute mark to see how they’re doing and if they're ready to exit the oven.
Bring muffins out of oven when ready and let pans cool on baking racks for a few minutes before carefully removing mini muffins and letting them cool.
If you’re coating them, pour cinnamon and granulated sugar into a bowl and mix. Before serving, roll muffins in mixture.