Preheat oven to 350 degrees.
Bring a medium pot of water to a boil over medium-high heat.
Add chicken and season with salt. Cover and reduce heat to medium.
Let the pot simmer until chicken is cooked completely through, about 10 minutes.
Drain water from the pot and allow chicken to cool. Then, shred with two forks and set aside.
Heat olive oil in a large pan over medium heat.
Add the kale and cook until wilted. Then, add the garlic and cook until fragrant, about 1 minute.
Carefully pour in half of the pumpkin, broth, and salsa and cook, stirring, for about 5 minutes.
Stir in the shredded chicken and begin filling the tortillas. Roll the tortillas up and place seam-side down in a 9"x13" dish.
In the same saucepan, add the other half of the pumpkin, broth, and salsa. Bring to a boil, then lower heat.
Spoon the sauce over the top of the enchiladas. Cover the enchiladas with foil and bake for 20 minutes.
Allow enchiladas to cool slightly. Then, top with queso fresco and fresh cilantro, if desired.