In a large mixing bowl, add 10 ounces of pure pumpkin purée, 150 grams of granulated sugar, 75 grams of packed light brown sugar, Whisk. Then add 85 grams of melted unsalted butter, 1 large egg, and 1 1/2 teaspoons of vanilla extract. Whisk everything together until smooth and fully combined.
In a separate bowl, whisk together 175 grams of all-purpose flour, 45 grams of cake flour, 3/4 teaspoon of baking soda, 3/4 teaspoon of ground cinnamon, 1 teaspoon of pumpkin pie spice, 1/4 teaspoon of cardamom, and 3/4 teaspoon of fine kosher salt.
Gradually add the dry ingredients to the wet ingredients, folding them in thirds, being careful not to overmix. Fold until just combined.
Pour the pumpkin bread batter into the prepared loaf pan and smooth the top.
Remove the streusel topping from the fridge - crumble it up with your fingers and evenly sprinkle it over the batter. Use all if it!
Bake the pumpkin bread for 75-80 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
Allow the bread to cool in the pan for at least 20 minutes before gently lifting it out (using the parchment paper overhang if you lined your pan) and transferring it to a wire rack to cool completely.
If you didn't use parchment paper, after your loaf has cooled - gently slide it out into your free hand (assuming you used a trustworthy loaf pan that doesn't stick).