White Chili with Tofu and Hominy

Name: White Chili with Tofu and Hominy
Ingredients: 6 tablespoons vegetable oil; 1 white onion, chopped, plus more for topping; 2 poblano peppers, chopped; 8 ounces parsnips (2 to 3), peeled and chopped; Kosher salt; 2 cloves garlic, chopped; 21/2 teaspoons ground cumin; 21/2 teaspoons ancho chile powder; 2 cups low-sodium vegetable broth; 2 15-ounce cans hominy, drained and rinsed; 2 4-ounce cans diced green chiles; 1 14-ounce package firm tofu, cut into 3/4-inch pieces and blotted dry; Sour cream, chopped fresh cilantro and diced avocado, for topping