Casserole Enchilada Ayam Tomatillo Panggang

Bahan-bahan (6 porsi)

• 15 tomatillos, paper removed
• 3 jalapeño peppers
• 4 cloves garlic
• 1/2 cup loosely packed cilantro leaves
• 1/4 cup loosely packed green onions (green parts)
• up to 1 1/2 cups chicken or vegetable broth (SEE NOTES)
• 1/2 cup sour cream
• 2 tablespoons olive oil
• 6 8 -inch flour tortillas
• 1 lb . boneless, skinless chicken breasts
• 1 1/2 cups shredded cheese