Preheat your oven to 375.
Drizzle a couple teaspoons of olive oil onto a rimmed cookie sheet and rub in with your hands. You could also add foil and spray/rub oil, too, for easier clean up.
Cut your butternut squash in half lengthwise and scoop out the seeds.
Drizzle a bit more olive oil on the squash, rubbing to coat. Sprinkle on some kosher salt and black pepper.
Place your cut and seasoned squash face down onto your prepared pan.
Poke holes in your sweet potato and rub lightly with olive oil. Place on prepared pan.
Keeping your quartered onion sections intact, drizzle with a bit of olive oil and rub lightly. Sprinkle with salt and pepper and place on prepared pan.
Place your baking sheet into your oven and pour ¼ cup water directly onto the pan. Trust me, here! This will steam your butternut squash while also allowing it to get color from contact with the pan.
Check on your sweet potato and onion at about the 30 minute mark. Flip over/rotate as needed to keep from burning.
Check on your onion about 15 minutes later. If it's browning too quickly, remove and set to the side.
After an hour total of cooking time, check on your squash and sweet potato. You should be able to easily pierce both with a fork. (But flip over your squash first! Sometimes the skin is too tough to pierce.)
Let your vegetables cool slightly before scraping into a food processor or blender.
Add the onion, coconut milk, Better than Bouillon, curry powder, turmeric, and salt.
Blend until your heart's content. Taste and adjust seasonings as needed.
Serve immediately (it's usually warm enough!) or let cool to room temperature to store for lunches.
I LOVE topping this with some roasted garlic salt and Unexpected Cheddar from Trader Joe's. But feta's a great substitute! Any salty cheese will do.