Preheat oven to 350°F. Spray a loaf pan with cooking spray.
Mix together the yogurt, pumpkin, eggs, and peanut butter in a large bowl until smooth.
Mix in the sugars, pumpkin pie spice, baking soda and flours until fully incorporated.
Fold in 3/4 cup chocolate chips into batter.
Pour the batter into the prepared pan. Sprinkle the remaining chocolate chips over the top.
Bake in the preheated oven for around 45 minutes, until a toothpick comes out clean.