Preheat your oven to 425°F (220°C) conventional (see note 1 if using a convection oven) and line a 12-hole standard muffin tray with muffin liners. Set aside.
Prepare the cinnamon sugar topping by mixing the sugar and cinnamon in a small bowl. Stir well and set aside.
In a bowl, sift together flour, cornstarch, baking powder, baking soda, salt, cinnamon, ginger, cloves, and nutmeg. Using a whisk, mix until well combined. Set aside.
In a large mixing bowl combine soft brown sugar, eggs, vegetable oil, vanilla and blended pineapple. Using a whisk, mix until well combined.
Add your dry ingredients to your wet mixture and using a spatula, gently fold together until just combined. Do not overmix.
Add in the grated carrots and walnuts and/or pecans. Using a spatula, gently fold until just combined. Do not overmix.
Distribute the batter evenly among the muffin liners—they should be about ¾ full. Evenly sprinkle the cinnamon sugar mixture prepared earlier on top.
Bake at 425°F (220°C) for 8 minutes, then reduce the oven temperature to 350°F (180°C) and bake for a further 8 minutes, or until a toothpick inserted into the centre comes out clean or with a few moist crumbs.
Allow the muffins to cool in the tray for 15 minutes before transferring to a wire rack to cool completely. Enjoy!