- Heat the oven to 400?F. Take a 1-quart baking dish; coat the dish with the non-stick cooking spray. Take a microwave-safe bowl; place butternut squash in it with little water. Place in the microwave and cook for 8 minutes. Drain and then mash them.
- Now put together the flour, squash, milk, sugar, vanilla, nutmeg, cinnamon, egg and salt in a baking dish. Mix them well. In a bowl; mix brown sugar and nuts. Scatter the nut mixture over the mixture in the dish and bake for 20 minutes until set.
- Serve Butternut Squash Soufflé Recipe at once.