Pressure Cooker Butternut Squash Soup
1 (3 pound) butternut squash - peeled, seeded… 1 large onion, coarsely chopped 1 pint half-and-half 1 tablespoon plain yogurt, or to taste 1 teaspoon salt 2 sweet potatoes, peeled and cubed 2 tablespoons olive oil 3 apples, peeled and cubed 3 large cloves garlic, crushed 4 cups vegetable broth, or more to taste ¼ teaspoon ground black pepper, or to taste ¼ teaspoon ground cumin, or to taste ¼ teaspoon ground ginger, or to taste ¼ teaspoon ground nutmeg, or to taste ½ teaspoon ground cinnamon