Sweet Potato and Pecan Waffles

Name: Sweet Potato and Pecan Waffles
Ingredients: 1 medium sweet potato, baked until tender, skin removed, and mashed (about 3/4 cup); 1 cup rolled oats; 1 cup unsweetened almond, coconut, or cashew milk; 2 eggs or egg replacer equivalent; 3 tablespoons unsweetened almond butter; 1 tablespoon flax meal; 2 teaspoons baking powder; 1 teaspoon pure vanilla extract; 1 teaspoon ground cinnamon; Zest of 1 medium clementine; Pinch of ground cardamom; Pinch of ground nutmeg; ½ cup chopped pecans, plus more for topping; Olive oil cooking spray; Maple syrup, for serving (optional)