Cook the chicken and shred it with forks or use leftover cooked chicken.
Whisk the marinade ingredients together in a liquid measuring cup (Should make about 1 cup). Add 2/3 cup of the marinade into the bowl with the chicken. Cover and refrigerate for 30 minutes or up to several hours.
Add Salsa verde to the remaining ⅓ cup of marinade and stir to combine. If the green chiles are chunky, pulse the sauce with an immersion blender until smooth.
Add black beans and corn to the chicken mixture. Fill the flour tortillas with a spoonful of the chicken filling and sprinkle a generous handful of cheese on top (reserving about 1 cup of cheese for topping on the enchiladas at the end).
Roll up the flour tortillas and place them in the pan, seam side down.
Pour the Salsa verde sauce on top of the enchiladas. Sprinkle with remaining cheese.
Bake at 350 degrees F for 30 minutes, then place under broiler for 2-3 minutes or until cheese is golden.