Line a baking sheet with foil and space out poblano peppers on top of foil.
Broil pepper for 12-15 minutes, flipping halfway through.
Remove peppers from oven and cover pan tightly with foil for 8 minutes to steam the peppers as they cool.
Uncover peppers and remove stems and charred skin, then slice peppers in half and remove seeds.
Preheat oven to 350 degrees and grease a 9×13-inch baking dish.
Using half the peppers, arrange a flat layer covering the bottom of the prepared baking dish. Top peppers with half the cheese then repeat another layer of peppers, another layer of cheese.
In a medium bowl, whisk together the eggs, milk, flour, and seasoning until smooth. Pour mixture over the layered dish.
Bake for 40-45 minutes or until top is starting to turn golden.
Serve with sour cream, cilantro, salsa, and avocado.
