Preheat oven to 400F and line a large baking sheet with parchment paper.
Chop the kabocha squash in half (carefully!) and scoop out the seeds. Slice off the hard stems at the top and bottom of the squash.
Slice the squash into about 1" thick slices. Spread evenly onto baking sheet.
Spray with olive oil spray or drizzle olive oil and mix to evenly distribute.
Sprinkle on the salt, garlic powder, and smoked paprika evenly across the slices.
Bake for 20-25 minutes until slightly browned and easily pierced with a fork.
Herby Tahini Sauce
While the squash is cooking, make the sauce.
Add tahini, lemon juice, and water to a food processor and mix until fully combined. The tahini tends to thicken at first when mixed with liquid, so you may need to add another tbsp more water to get a creamy consistency.
Add herbs and salt and blend for 2-3 minutes until the herbs are mostly chopped up and the sauce is a bright green color.
Drizzle the sauce over the squash and/or place on the side as a dipping sauce.