Chipotle Chicken and Rice (my version of Arroz con Pollo)

Bahan-bahan (6 porsi)

• 1 1/2 lbs chipotle chicken (I used 4 boneless skinless thighs, grilled or broiled and chopped bite size, about 3 cups chicken)
• 2 cups rice
• 4 cups broth
• 1 tablespoon butter
• 1/2 large onion (about 1 cup diced)
• 1/2 teaspoon kosher salt
• 1 chipotle pepper in adobo sauce (minced fine)
• 28 ounces diced tomatoes
• 1 1/2 tablespoons Mexican spice mix (taco seasoning can be substituted)
• Optional: Sour cream and/or chopped cilantro for topping