To a large skillet over medium heat, add a drizzle of olive oil and then add onion and poblano. Let saute for 2-3 minutes to soften.
Add diced chicken to vegetables with salt and taco seasoning and let cook for 2 minutes before tossing to help the chicken brown. Let chicken continue to cook and stir in garlic and black beans. Saute for 2-3 more minutes until chicken is cooked through. Set skillet off the heat.
Slice tortillas into 1-inch strips and began assembling the enchilada bake. Begin by adding 1/4 cup of the sauce on the bottom of the casserole dish and spread out, so tortillas won't stick.
Next, add 1/3 of the tortilla strips in rows to cover the bottom of the dish followed by 1/2 of the chicken filling, 1/2 of the pumpkin sauce and 1/2 of the shredded cheese.
Next, layer the next 1/3 of tortilla strips, followed by the remaining chicken filling. Finish with the last 1/3 of tortilla strips, the remaining pumpkin sauce, and the remaining cheese.
Bake on the middle rack until cheese is melted and casserole is bubbling, about 15-18 minutes. Garnish with a sprinkling of the reserved black beans, fresh radish and cilantro. Enjoy!