Pre heat oven to broil.
Prepare any garnishes while chicken is poaching.
Poach chicken by fully covering with water and add 1 tsp. Kosher salt and 1 tsp peppercorns. Bring to a boil, reduce heat and simmer 20 minutes until cooked through. Remove chicken from water, let cool slightly and shred with 2 forks. Set aside.
If purchasing a rotisserie chicken, shred with 2 forks and set meat aside.
To assemble the enchiladas, heat the shredded chicken and ¼ cup (60 gr) Green Enchilada Sauce in a skillet over low heat.
In a small skillet heat a TBSP olive oil and sauté 1 corn tortilla until soft, remove to a plate and fill with 1/3 of chicken. Roll or plate tortilla in half on an oven safe platter. Repeat with remaining tortillas and chicken.
Drizzle remaining ¼ cup Green Enchilada Sauce over the tortillas and top with crumbled Queso Fresco.
Place under broiler for about 2 minutes to heat the sauce.
Remove enchiladas from the oven and garnish with black olives, red onion, cilantro, if using. Set sour cream and Refried Black Beans on the plate.
Serve immediately.