All of the flavor of Chili Rellenos without all the work.
Swapping canned green chiles for fresh roasted poblano peppers changes the moisture content drastically, requiring extra draining time in a colander to prevent a watery bake. Roasting fresh peppers adds char and depth, but canned varieties offer reliable water volume and predictable layering properties when split open and seeded. Arranging these chiles in an alternating flat pattern creates a uniform base that absorbs the egg custard without slipping. Draining canned chiles thoroughly for at least fifteen minutes removes excess brine that would otherwise dilute the cheese and eggs. Beating the eggs, milk, cumin, and ground ancho chile powder until completely homogenous ensures the spices disperse evenly rather than clumping in pockets. Covering the nine-by-thirteen-inch glass dish with foil for the first fifteen minutes of the thirty-seven-hundred-seventy-five-degree oven cycle prevents the top cheese layer from burning before the internal custard sets. Removing the foil allows steam to escape so the remaining baking time can reduce moisture and brown the dairy solids. Testing for doneness relies on visual and textural cues rather than a thermometer. The center must bubble actively, and the edges should pull slightly away from the casserole dish with a firm, set consistency that lacks any liquid slosh. When preparing this dish ahead of time, assemble the unbaked layers up to twenty-four hours in advance and refrigerate them covered, adding five to ten minutes to the initial covered baking time to compensate for the cold start. Leftovers freeze acceptably for up to two months when wrapped tightly in plastic and foil, though thawed portions release extra water upon reheating and benefit from a quick blot with a paper towel before being warmed in a three-hundred-fifty-degree oven.