Preheat oven to 350℉ and line an 8x8 baking pan with parchment paper or spritz pan with non-stick cooking spray.
In a medium mixing bowl, whisk together flour, pumpkin spice, baking powder, and salt. Set aside.
In a large mixing bowl, cream together butter and brown sugar. Scrape sides of bowl as needed. When you think you have it fully combined, scrape the sides again and continue beating the mixture for a few more minutes.
Mix eggs and vanilla into butter/sugar. Scrape sides of bowl and add pumpkin puree. The puree will not fully combine but you want it evenly distributed.
Gradually stir in dry ingredients until just combined.
With a wooden spoon or rubber spatula, stir in chocolate chips.
Pour mixture into prepared pan. If using flaked salt, sprinkle over batter. Bake 30 minutes or until test toothpick come out almost clean.