Preheat your oven to 350°F (175°C) and grease a donut pan or use a silicone mold for easy release.
In a large mixing bowl, whisk together the whole wheat pastry flour, baking powder, baking soda, cinnamon, nutmeg, and salt until well combined.
In another bowl, mix the maple syrup, Greek yogurt, almond milk, melted coconut oil, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix.
If desired, fold in dark chocolate chips or chopped nuts for an extra flavor boost.
Spoon the batter into the prepared donut pan, filling each cavity about two-thirds full.
Bake in the preheated oven for 12-15 minutes, or until the donuts are golden and a toothpick inserted in the center comes out clean.
Let the donuts cool in the pan for a few minutes before transferring them to a wire rack to cool completely.
For a finishing touch, sprinkle with coconut sugar or cinnamon sugar while still warm, or dip them in melted dark chocolate.