Preheat the oven to 350 degrees.
Spray a 9X13 inch pan with non-stick spray.
In a large bowl, beat together the softened butter and brown sugar. Then mix in the eggs, pumpkin puree, and vanilla until smooth.
In a separate bowl, whisk together the flour, baking powder, cinnamon, ginger, nutmeg, and salt. Then add these dry ingredients to the wet ingredients (butter, sugar, etc). Mix this well.
Stir in the chocolate chips.
Pour this mixture into the baking pan. The batter is VERY thick so use a spatula to even it out in the pan and make sure it’s level before baking.
Bake for 30 minutes. Test for doneness with a toothpick.