Summer Vegetable Chili

Name: Summer Vegetable Chili
Ingredients: 3 tablespoons vegetable oil; 1 medium red onion, chopped; 3 cloves garlic, chopped; 2 tablespoons chili powder; 2 teaspoons ground cumin; 1 poblano chile pepper, seeded and diced; 2 portobello mushrooms, stemmed and chopped; 2 cups frozen corn (preferably fire-roasted), thawed; 2 14-ounce cans no-salt-added pinto beans; 1 14-ounce can no-salt-added diced tomatoes; Kosher salt and freshly ground pepper; Shredded cheddar cheese, sour cream and/or torn fresh cilantro, for topping (optional); 8 corn tortillas, warmed