1. Preheat oven to 350˚F. Lightly grease and flour a 9×5 inch loaf pan.
2. In a stand mixer, cream together butter, brown sugar, and pumpkin pie spice.
3. Add eggs one at a time, beating well after each addition. Scrape down the sides of the bowl midway through the mixing process.
4. Turn the mixer to low and beat in pumpkin puree.
5. Add Pioneer Baking Mix to the bowl, beating until the batter is smooth.
6. Pour the batter into the prepared pan and bake for 45 minutes, or until a thin knife inserted into the center comes out clean.
7. Remove the cake from the oven; cool for 10 minutes before turning the cake out onto a cooling rack.