Preheat the oven to 350°F (175°C) and grease a 9x9 inch baking pan to ensure easy removal of the bars once baked.
In a large mixing bowl, combine 1 cup of canned pumpkin puree, 1/2 cup brown sugar, 1/4 cup white sugar, 1/2 cup melted butter, and 1 tsp vanilla extract. Mix thoroughly until the mixture is smooth.
In another bowl, whisk together 1 cup all-purpose flour, 1/2 tsp baking powder, 1/2 tsp baking soda, 1/4 tsp salt, 1/4 tsp ground cinnamon, and 1/4 tsp ground nutmeg. This dry mix will provide structure and flavor to your bars.
Gently combine the dry ingredients with the pumpkin mixture. Use a spatula to fold them together until just combined, being careful not to overmix.
Fold in 1/2 cup chocolate chips until evenly distributed throughout the batter.
Pour the mixture into the prepared baking pan and spread it evenly using a spatula, ensuring even baking.
Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Your bars should be slightly golden on top.
Once baked, allow the bars to cool slightly in the pan before transferring them to a wire rack. Cut into squares and enjoy!