Begin by making the pumpkin sour cream sauce: In your food processor or blender combine pumpkin puree, tomato sauce, low fat sour cream, water or broth, garlic, chili powder, cumin, and red cayenne pepper; puree until smooth. You can also do this in a large bowl. Taste and season with salt and pepper.
Preheat oven to 350 degrees F. Spray 9x13 baking dish with nonstick cooking spray and add 3/4 cup of pumpkin sauce to the bottom; use a spatula to spread out evenly. Set pan aside.
Place shredded chicken in large bowl and add 3/4 cup of the pumpkin-sour cream sauce to it. Set aside.
Next make the filling: Heat large non-stick pan over medium heat and add olive oil. Add onion, jalapeño and minced garlic and cook 3-5 minutes or until onions begin to soften.
Remove from heat and transfer into the bowl with the chicken, then add in the black beans and 1 cup of the pumpkin sauce. Stir to coat the filling.
Next warm tortillas in microwave for about 20 seconds so they are easier to roll. You can splash a little water on them before microwaving to make them more pliable.
Then, place about 1/4 cup mixture on each tortilla. Sprinkle 1 tablespoon of cheese in each tortilla. Roll each tortilla and place seam side down in baking pan. Pour remaining pumpkin sauce on top of all the tortillas and then sprinkle remaining 1 1/4 cup cheese on top.
Bake for 20-30 minutes until cheese is melted and edges of tortillas begin to turn golden brown. Top with sour cream, avocado, or cilantro.
