Preheat your oven to 350°F. Grease a 9×5-inch loaf pan and line it with parchment paper, then grease the parchment paper.
In a small bowl, combine flour, cornstarch, baking soda, baking powder, salt, pumpkin spice, and cinnamon. Set aside.
In a large mixing bowl, beat the eggs, granulated sugar, and brown sugar with an electric mixer until well combined and lighter in color (about 1-2 minutes).
Add the pumpkin puree, oil, and vanilla, and mix well.
Slowly add the dry ingredients to the wet mixture, mixing on low speed until almost fully combined. Stir in the chocolate chips.
Pour the batter into the prepared loaf pan. Sprinkle the crumble topping evenly over the batter.
Bake for about 60 minutes, checking at 50 minutes with a toothpick to see if it comes out clean. If the bread browns too quickly but isn’t baked through, cover it with foil and continue baking.
Remove from the oven and cool for at least 20-30 minutes before removing from the pan.