Preheat your oven to 350°F (175°C) so it’s ready when your batter is done. Line a 9x13-inch baking pan with parchment paper or lightly grease it. This ensures easy removal and clean slicing after baking.
In a large bowl, whisk together melted butter, brown sugar, and granulated sugar. Add pumpkin puree, eggs, and vanilla extract and mix until smooth. This mixture should look creamy and well blended without lumps.
In a separate bowl, whisk flour, baking powder, baking soda, cinnamon, nutmeg, and salt.Slowly add dry ingredients into the wet mixture. Stir gently until just combined—avoid overmixing for soft bars.
Fold in chocolate chips using a spatula until evenly distributed. You can reserve a handful for sprinkling on top for extra appeal. This step ensures every bite has a rich chocolate burst.
Pour batter into the prepared pan and spread it evenly. Bake for 25–30 minutes or until a toothpick inserted comes out mostly clean. Do not overbake to keep the bars soft and moist.
Allow the bars to cool completely in the pan before cutting. Cooling helps them set and makes slicing cleaner and easier. Cut into squares and enjoy your homemade pumpkin treat.