Char each side of peppers for 8-10 minutes, then cover with another baking sheet or foil for 15 minutes to steam. Peel, remove stems and seeds, chop, and they're ready to use!
Cook sausage until fully cooked, add chopped scallion and cook until softened, then drain excess liquid or grease.
In a large bowl, mix sausage, hash browns, cheese, Poblanos (or green chiles), and season with salt and black pepper.
Set oven to 350°F, bake for 30-35 minutes until firm in the center, then let rest in the muffin pan for 5-10 minutes.
Use a paring knife to loosen muffins' edges from the pan.