Thaw frozen hash browns completely and squeeze out excess moisture with a kitchen towel, then sauté them in a hot skillet for 3-4 minutes before layering to achieve a crispy texture that won't become soggy.

Toast the cumin and chili powder in a bit of butter or oil before mixing into the egg custard to unlock deeper, more complex flavors that elevate the entire dish.

Pat canned green chilies dry with paper towels and drain any excess liquid to prevent a watery casserole and concentrate their authentic flavor throughout.

Prepare the casserole up to 24 hours ahead and refrigerate covered—this allows flavors to meld beautifully and makes for easier morning preparation and more even cooking.

Place your casserole dish in a larger pan filled with hot water halfway up the sides during baking to ensure gentle, even cooking and a creamy custard texture without dry, rubbery eggs.