Ina Garten's Chicken Chili

Bahan-bahan (12 porsi)

• 8 cups chopped sweet onions ((about 6 onions))
• 2 tablespoons extra virgin olive oil
• ¼ cup minced garlic ((8 cloves))
• 4 medium red bell peppers ((cored, seeded and roughly chopped))
• 4 medium yellow bell peppers ((cored, seeded and roughly chopped))
• 2 teaspoons chili powder
• 2 teaspoons ground cumin
• ½ teaspoon red pepper flakes ((more or less, to taste))
• ½ teaspoon ground cayenne pepper ((more or less, to taste))
• 4 teaspoons kosher salt, (plus more for chicken)
• Four 28-ounce cans whole peeled plum tomatoes in puree, (undrained)
• ½ cup minced fresh basil
• 6 cups shredded cooked chicken breasts
• freshly ground black pepper
• onions, corn chips, grated cheese, sour cream ((suggested toppings))