In a small bowl, mix ground flaxseed with 5 tablespoon water. Set aside for 5 minutes to thicken.
In a large bowl, whisk together flour, baking powder, cinnamon, nutmeg, and salt.
In another bowl, mix mashed sweet potato, plant-based milk, maple syrup, vanilla extract, and the flaxseed mixture.
Pour the wet ingredients into the dry ingredients and mix until just combined. Fold in the melted coconut oil. Let the batter rest for 10 minutes.
While the batter is resting, make the maple pecan crumble. In a small pan over medium heat, toast the chopped pecans for 2-3 minutes. Add maple syrup, cinnamon, and salt. Cook for another 1-2 minutes until the mixture is sticky and fragrant. Remove from heat and set aside.
Heat a non-stick pan or griddle over medium heat. Lightly grease with coconut oil.
For each pancake, pour about ¼ cup of batter onto the pan. Cook until bubbles form on the surface (about 2-3 minutes), then flip and cook for another 1-2 minutes.
Serve pancakes warm, topped with the maple pecan crumble and additional maple syrup if desired.