Preheat oven to 350°F and spray a muffin pan with coconut oil or add muffin liners.
In a large bowl, mix together wet ingredients — pumpkin purée, almond butter, maple syrup, non-dairy milk, vanilla extract, and apple cider vinegar — until smooth.
In a separate bowl, whisk together dry ingredients — oat flour, plant protein, pumpkin pie spice, salt, and baking powder.
Combine wet and dry ingredients until a smooth batter forms.
Scoop batter evenly into muffin pan and top with chopped pecans.
Bake for 20–25 minutes, or until a toothpick inserted in the center comes out clean.
Let muffins cool before removing from the pan.