01 -  Preheat oven to 350°F. Line a standard muffin tin with 6 paper liners. 
 02 -  In a large mixing bowl, whisk flour, brown sugar, baking powder, baking soda, salt, cinnamon, ginger, and nutmeg until evenly blended. 
 03 -  In a separate bowl, whisk pumpkin puree, vegetable oil, egg, and milk until smooth. Add wet mixture to dry ingredients and mix gently until just incorporated. Fold in 1/2 cup mini chocolate chips without overmixing. 
 04 -  Spoon batter into prepared muffin liners. Bake muffins for 15 minutes, or until a toothpick inserted in the center comes out clean. Allow to cool fully, then cut three muffins into 1-inch cubes for mix-ins. 
 05 -  In a clean bowl, whisk heavy cream, whole milk, granulated sugar, pumpkin puree, vanilla extract, pumpkin pie spice, and salt until smooth and sugar has dissolved. 
 06 -  Transfer mixture into an ice cream maker and churn according to the manufacturer's instructions, typically 20 to 25 minutes, until thickened and creamy. 
 07 -  Once ice cream is nearly set, gently fold in muffin cubes and 1/2 cup mini chocolate chips using a spatula. 
 08 -  Move churned ice cream into a freezer-safe container. Cover tightly and freeze for at least 4 hours until solid. 
 09 -  Scoop ice cream into bowls and serve. Garnish with extra muffin cubes or chocolate chips as desired.