Preheat oven to 375℉.
Place baking rack in baking tray. Set aside.
Place shredded chicken in a large mixing bowl. Add salsa, salt, cumin, chili powder, onion powder, and garlic powder. Stir to combine.
Add softened cream cheese and shredded Pepper Jack cheese. Stir to combine.
Place 4-5 corn tortillas between wet paper towels and microwave for 15-20 seconds until tortillas are soft.
Place about 2 tablespoons of the chicken filling onto each tortilla.
Roll tortillas around the filling.
Place tortillas seam side down on baking rack.
Spray tortillas lightly with cooking spray.
Bake in the oven for 15-20 minutes or until tortillas are golden brown and the filling is hot.
Remove from oven and top with shredded cheddar cheese.
Return to the oven and heat for an additional 5 minutes or until cheddar cheese is melted.
Serve topped with a dollop of sour cream and salsa for dipping if desired.