Let’s dive into the creation of these scrumptious bars. Here’s a step-by-step guide to making them:

1. Preheat your oven to 350°F (175°C) and grease a 9×9-inch baking pan or line it with parchment paper for easy removal.
2. In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ground ginger, and salt. Set aside.
3. In a large bowl, combine the pumpkin puree, granulated sugar, brown sugar, and vegetable oil. Mix until well incorporated.
4. Add the eggs one at a time, beating well after each addition, then stir in the vanilla extract.
5. Gradually add the dry ingredients to the wet ingredients, mixing just until combined. Be careful not to overmix to keep the bars tender.
6. Pour the batter into the prepared baking pan and smooth the top with a spatula.
7. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
8. While the bars are baking, warm your salted caramel sauce slightly to make it pourable.
9. Once the bars are out of the oven, allow them to cool for about 10 minutes before drizzling the salted caramel sauce on top.
10. Finish with a sprinkle of sea salt flakes and let the bars cool completely before slicing into squares.

As a tip from experience, always let the bars cool completely before cutting to ensure clean edges and keep the caramel from sticking to your knife.