Saute onion and garlic in 1 T butter until translucent. Combine with turkey, cheese, salt, paprika, chipotle, and cayenne.
Preheat oven to 400 degrees.
Slit poblanos open lengthwise, and then across the top, forming a "T". Stuff peppers with turkey mixture, brimming over the top.
Sprinkle panko crumbs over the tops of the peppers, then drizzle with melted butter.
Bake about 30 minutes, until filling is bubbling. Turn oven up to broil until tops are browned and crispy.
While poblanos are baking, cook enchilada sauce. Combine tomato sauce with spices, simmer until ready to serve.
Remove poblanos from oven, let cool 15 minutes. Plate peppers, top with sauce.