Preheat oven to 350F. Line or spray a 9x5" loaf pan.
Mix both types of sugar with peanut butter and pumpkin.
Stir in eggs, pumpkin pie spice and baking soda and mix until combined.
Stir in milk/vinegar mixture and flour until just combined.
Fold in the chocolate chips and walnuts.
Pour batter into prepared pan and bake for 40-45 minutes.
Let bread cool before cutting.
Recipe Notes
The combination of milk and vinegar is a make-your-own buttermilk. It works with cows, almond, coconut and any other type of milk - and much cheaper than the store-bought buttermilk.