In a small skillet heat olive oil on medium heat and add onions. Cook 3-5 minutes then add garlic and cook another 30 seconds. Remove from heat.
In a medium bowl whisk 1/2 cup enchilada sauce, 1/4 cup sour cream until combined. Mix in chicken, onions, garlic, cream cheese, chiles, cumin, salt, pepper and 1 1/2 cups pepper jack cheese.
In a small bowl add the remaining enchilada sauce and the remaining 1/4 cup sour cream and whisk until combined.
Place a few corn tortillas on a microwave safe plate and cover with a damp paper towel. Heat 30-45 seconds to steam.
Then add about 1/2 cup chicken mixture to each tortilla, roll up and place seam-side down in the baking dish. Repeat until they are done. Pour the enchilada sauce mixture over the rolled tortillas. Sprinkle the remaining cheese over the top
Bake uncovered for 30-35 minutes or until hot and bubbly.
Video
Notes
Pepper Jack cheese can be swapped out for a Mexican blend of cheese or just cheddar cheese. Soft flour tortillas can be used instead of corn. No need to pre-cook flour tortillas prior to assembling the enchiladas.