Enchiladas Verdes (Green Enchiladas)

Bahan-bahan (9 porsi)

• 1 lb 2 boneless, skinless chicken breasts
• 1 onion (halved and divided)
• 1 teaspoon kosher salt
• 18 white corn tortillas
• 3 cups salsa verde (jarred or homemade)
• 1 cup crumbled queso fresco
• sour cream (optional to serve)
• cilantro (optional garnish)