Butternut Squash without julienne

1 butternut squash 1 tablespoon olive oil 1 onion 2 -3 celery ribs 900 ml chicken stock (about 2 Cups) 1 teaspoon prepared bottled garlic (or one clove) 1[...]

2 (14 ounce) packages frozen butternut squash, thawed 3 cups milk 2 1/2 tablespoons cornstarch 1 (14 3/4 ounce) can creamed corn 1/2 cup frozen peas, thawed 1[...]