Noodle & Mushroom Souffle

Call it a souffle, call it a nudelauflauf, either way this is a German-Swiss casserole built in layers and bound with a savory custard. Cooked noodles go on the bottom, then a browned ground beef mixture studded with leek and mushroom, tomato slices, and sheets of melting cheese, alternating twice before a cream-and-egg pour locks it together in the oven.

The custard is the structural key. Four eggs whisked with 15 ounces of cream set into a silky slab that holds the layers but never turns rubbery. Never fill the dish past three-quarters. The custard puffs a lot during baking and will spill otherwise.

American cheese melts to a gooey bind while Emmentaler contributes nutty depth and stretch. Both together beat either on its own.

Kitchen Tips

• Undercook the noodles by a minute or two. They keep absorbing custard in the oven and will overshoot to mushy if fully cooked on the stove.
• Drain the browned beef mixture before layering. Extra grease pools on top and prevents the cheese from browning properly.
• Bake at 400°F to 425°F (200°C to 220°C) until the top is deep gold and the custard no longer jiggles in the center, about 45 minutes.
• Let the casserole rest 10 minutes before cutting. The custard firms up as it cools, making clean squares possible.

Variations

• Swap ground beef for ground turkey or Italian sausage for a different profile.
• Use Gruyère in place of Emmentaler for a sharper, fuller flavor.
• Replace canned mushrooms with a mix of fresh cremini and chanterelles sautéed until dry for far better texture.