Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, cream together the peanut butter, shortening, and brown sugar until light and fluffy.
Add the eggs one at a time, beating well after each addition. This ensures that the eggs are fully incorporated into the mixture.
Add the nutmeg, sour cream, cinnamon powder, and vanilla extract to the bowl. Mix until well combined.
In a separate bowl, whisk together the bread flour, baking soda, and salt. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
Gently fold in the chocolate chips until evenly distributed throughout the cookie dough.
Using a cookie scoop or spoon, drop rounded tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake the cookies in the preheated oven for 10-12 minutes, or until golden brown around the edges.
Remove the cookies from the oven and let them cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.