Grease and line a 8x4-inch or 9x5-inch with a sheet of parchment so that you have extra on the sides (this makes it easy to lift the loaf out). Preheat oven to 350 degrees F. *If you use a 9x5-inch loaf pan, it’ll be a bit more stout than using a 8x4-inch.
In a large bowl, whisk together the flour, white and black sesame seeds, baking powder, baking soda, pumpkin pie spice and salt.
In another medium bowl, whisk together pumpkin puree, oil, tahini, eggs and sugar, until very smooth.
Pour the wet ingredients into the dry ingredients and mix until just combined, being sure not to over-mix. Add the batter to the loaf pan and smooth out the top.
Sprinkle the top with sesame seeds. Bake for about 45 to 50 minutes, until a skewer comes out mostly clean (a few crumbs are ok!).
Cool in pan for about 10 minutes and then remove and place on a cooling rack.