Butternut Squash and Parmesan Soup without greens pasta

3 cups butternut squash peeled and cut into 1/2 inch cubes * 1 x nonstick cooking spray * 1/2 teaspoon salt divided 1 1/4 teaspoons olive oil 1 1/4 cups onion[...]

2 1/2 pounds butternut squash 2 tablespoons butter 2 tablespoons olive oil or canola oil 4 cloves garlic minced, normal size, or 2 large cloves, or to taste 4[...]