Cheesy Poblano Frittata

Name: Cheesy Poblano Frittata
Ingredients: 1 tablespoon (15 ml) olive oil; 1/4 cup (40 g) finely chopped onion; 2 poblano peppers, seeded and finely chopped; 1 red bell pepper, cored, seeded and finely chopped; 1 tablespoon (1g) finely minced fresh cilantro leaves, plus more for garnish; 1/2 teaspoon ground cumin; 6 large eggs; 1 cup (235 ml) half-and-half; 1/2 teaspoon kosher or fine sea salt; 1/4 teaspoon freshly ground black pepper; 1 cup (120 g) shredded Colby or cheddar cheese, divided (I used Cabot Vermont Sharp); For the cooking pot: 1 1/2 cups (335 ml) water