Ingredients
Method
- Shred cheddar and Gruyere, reserve ½ cup cheddar.
- Melt butter, cook sliced onions until browned (20+ min).
- Stir in garlic, cook 1 minute.
- Stir in flour to form a paste, cook 1 minute.
- Warm half and half, slowly add to pan while stirring.
- Add rosemary, oregano, thyme, and sage. Simmer 5 minutes, remove from heat.
- Stir in 1 ½ cups cheddar and ½ cup Gruyere. Fold in diced ham, reserving some for topping.
- Preheat oven to 400°F (204°C).
- Peel and thinly slice potatoes.
- Grease a 9 x 13-inch dish. Layer ⅓ potatoes, season with salt and pepper.
- Spoon ⅓ cheese sauce over potatoes.
- Repeat layering twice.
- Sprinkle remaining cheddar and ham on top. Cover and bake for 30 minutes.
- Cool, cover, and refrigerate or freeze if preparing ahead.
- Remove cover. Sprinkle Parmesan on top. Reduce heat to 375°F (190°C), bake uncovered 25 minutes.
- Sprinkle with parsley, let sit 5 minutes before serving.
Notes
For a richer flavor, use heavy cream instead of half and half.
