Heat olive oil in a large skillet over medium heat. Add diced onion and sauté for about 5 minutes, until translucent.
Add the garlic and cook for another minute, stirring frequently.
Mix in the pumpkin puree, coconut milk, nutritional yeast, salt, pepper, cinnamon, and nutmeg. Stir to combine.
Add the cauliflower rice and stir well. Let the mixture simmer for about 10 minutes, stirring occasionally, until the cauliflower rice is tender and the mixture is thick and creamy.
Stir in the maple syrup and vegan butter. Adjust seasoning if necessary.
Serve warm and enjoy this delicious fall-inspired comfort dish.