Preheat oven to 350°F. Butter an 8-9 inch ovenproof glass or ceramic baking dish thoroughly, spreading at least 1 tablespoon evenly over bottom and sides.
2 tbsp butter
In a large bowl, whisk together 6 eggs, 1¼ cups milk, and ½ cup flour until the batter ribbons off the whisk and is smooth, about 2 minutes. Add salt, pepper, and nutmeg if using, and whisk to combine.
6 large eggs, 1.25 cups whole milk, 0.5 cup all-purpose flour, 0.5 tsp salt, 0.25 tsp black pepper, 0.25 tsp nutmeg
Pat 1 cup diced ham dry with paper towels, then scatter evenly in the buttered dish. Sprinkle 1 cup shredded Gruyère cheese evenly over the ham.
1 cup cooked ham, 1 cup Gruyère cheese
Pour the whisked batter over the ham and cheese in the dish, tilting gently to distribute evenly. Bake at 350°F for 35-40 minutes until the edges are golden and set and the center barely jiggles. A knife inserted should come out mostly clean.
6 large eggs, 1.25 cups whole milk, 0.5 cup all-purpose flour, 1 cup cooked ham, 1 cup Gruyère cheese
Remove the dish from the oven and let the clafoutis rest for 10 minutes to finish setting. Slice into wedges and serve warm, garnished with fresh chives or thyme if desired.
to taste fresh herbs
