La Fogata's Green Chicken Enchiladas

• 8 corn tortillas
• 2 serrano chiles
• 2 chicken breasts water (whole lightly salted)
• 1 clove garlic
• 1/4 tomatillos
• 240 ml sour cream
• 240 ml peanut oil
• 210 gr mozzarella cheese
• 240 ml chicken stock
• 120 ml water