Preheat oven to 425°F. Generously coat a miniature muffin tin with cooking spray. In a large bowl, combine the pumpkin, oil, eggs, and sugar. Whisk until smooth.
1 (15 ounce) can pumpkin puree, 1/2 cup canola oil, 3 large eggs, 1 and 1/4 cups granulated white sugar
Sprinkle the baking powder, baking soda, nutmeg, ginger, salt, and cloves over the liquid ingredients. Whisk again until evenly combined.
1 and 1/2 teaspoons baking powder, 3/4 teaspoon baking soda, 1/2 teaspoon each ground nutmeg, ginger, and table salt, 1/8 teaspoon ground cloves
Add the flour and fold in with a spatula or wooden spoon, mixing just until combined. It will look a little lumpy at first; keep mixing through that and until no streaks of flour remain, but stop at that point.
2 and 1/4 cups all-purpose flour
Divide batter evenly among the prepared muffin wells. (A #40 cookie scoop is the perfect size.) To make the topping, stir sugar and cinnamon together in a small bowl. Sprinkle evenly on top of the muffins.
2 Tablespoons granulated white sugar, 1/2 teaspoon ground cinnamon
Bake at 425°F for 5 minutes, then, without opening the oven door, reduce the temperature to 350°F and bake for another 7-9 minutes. When done, the muffins will have a copper-like crust on top, and a toothpick inserted into the centers will come out dry or with a few moist crumbs, but no large streaks of batter.
Let cool for 10-15 minutes in the pan, then remove to a wire rack to cool completely.