Preheat your oven to 350°F (175°C).
In a large bowl, combine the pumpkin puree, maple syrup (or honey), Greek yogurt, veggie oil, egg, and vanilla essence. Whisk until smooth.
In another bowl, whisk together the whole wheat flour, ground cinnamon, ground nutmeg, baking soda, baking powder, and salt.
Gradually add the dry mixture into the wet ingredients and gently fold until just combined.
Line a muffin tin with paper liners or grease it lightly. Spoon the batter into each muffin cup until about two-thirds full. Bake for approximately 18 minutes or until a toothpick comes out clean.
Let the muffins cool in the pan for about five minutes before transferring them to a wire rack.