For the muffins: Place an oven rack in the center of the oven. Preheat the oven to 350 degrees F. Line 24 mini-muffin cups with (1 1/2-inch) paper liners. Set aside.

In a medium bowl, sieve together the flours, salt, baking powder, baking soda, and cinnamon. Add any solids leftover in the sieve to the bowl and mix in.

In a separate medium bowl, whisk together the oil, syrup, and egg. Add the dry ingredients and mix until just combined. Mix in the grated carrot, grated zucchini, and raisins.

Using 2 small spoons, fill the prepared muffin cups 3/4 full with the batter and bake until light golden, about 15 minutes. Cool for 5 minutes. Transfer the muffins to a wire rack to cool completely, about 30 minutes.

For the frosting: In a small bowl, mix together the cream cheese and honey until smooth.

To serve: Spread the cooled muffins with frosting, if using, and serve.

Per Muffin (without optional cream cheese): Calories: 82; Total Fat: 5 grams; Saturated Fat: 0.5 grams; Protein: 2 grams; Total carbohydrates: 8 grams; Sugar: 5 grams; Fiber: 1 grams; Cholesterol: 9 milligrams; Sodium: 74 milligrams