Preheat oven to 400º F.
Wash, peel and cut the butternut squash into 1/2″ cubes. Place the cubes and thyme on a baking sheet and toss with just enough oil to evenly coat them.
Bake for 25-30 minutes, or until the edges turn golden brown, and the squash is soft. Stir half way through cooking.
Let the butternut squash cool slightly, then place it in a food processor with 1/4 cup of liquid. Blend until it forms a puree. Add more liquid as needed to achieve your desired consistency.