Place acorn and butternut squash halves and apple wedges on a baking sheet. Drizzle with olive oil and sprinkle with salt. Roast for 25-30 minutes, until squash is tender and lightly browned.
In a large pot, melt butter over medium heat. Add onion and garlic and sauté until softened, about 5 minutes. Add cinnamon and cook for 1 minute, stirring.
Add roasted squash and apple to the pot. Pour in vegetable broth and bring to a boil. Reduce heat to low and simmer for 15 minutes.
Using an immersion blender, blend soup until smooth. (Alternatively, transfer soup to a blender and blend until smooth).
Add maple syrup and lemon juice and season with salt and pepper, to taste. Simmer for a few minutes to heat through.
Serve warm, garnished with freshly chopped parsley, if desired.
Interesting Facts
Acorn squash is a type of winter squash, which is a good source of vitamin C, potassium, and dietary fiber.
Butternut squash is a type of winter squash that is high in vitamins A and C, as well as potassium and magnesium.
Apples are a good source of dietary fiber and vitamins C and K.