Is this cake actually savory?
Yes. The apples bring gentle sweetness, but cheddar, thyme, and Dijon pull it savory. If you want it even more savory, reduce the brown sugar to 1 tablespoon and add an extra pinch of salt.
What apples work best?
Use a firm, tart sweet apple: Honeycrisp, Pink Lady, Braeburn, or Granny Smith. Firm apples keep their shape and stay punchy. Softer apples can turn a little jammy and make the crumb wetter.
Can I make it without a cast iron skillet?
Absolutely. A 10-inch round cake pan (2 inches deep) is the closest match. You can also use a 9-inch springform (at least 2 1/2 inches deep), but the cake will be taller and may take a bit longer to bake. For easy release, grease the pan and line the bottom with a parchment round.
Do I really need to preheat the pan?
No, but it helps with those crisp, browned edges. If you preheat a cake pan or springform, do it for 5 minutes, then carefully remove it with oven mitts, set it on a sturdy surface or sheet pan, and grease immediately.
Can I swap the cheese?
Sharp cheddar is the main character, but Gruyère, aged Gouda, or white cheddar are great. Avoid super fresh mozzarella since it can get watery.
How do I know it is done without drying it out?
Look for a deep golden top and edges pulling slightly from the pan. A toothpick should come out with a few moist crumbs, not wet batter. Start checking around 40 minutes in a skillet or 10-inch pan, and around 45 minutes in a 9-inch springform.
Can I make it gluten free?
Yes, use a 1:1 gluten free baking flour blend. Let the batter rest 10 minutes before baking so the flour hydrates, which helps the texture stay smooth.
How should I store it safely?
If your kitchen is cool (around 70°F or below), it is fine at room temp for up to 2 days. If your room runs warm, refrigerate once fully cooled.