2 pounds fresh ripe peaches (cut into 1/4-inch thick slices)
3 tablespoons amaretto or peach brandy
1 cup half and half
1/2 cup (packed) light brown sugar
1 vanilla bean (split)
1/4 teaspoon ground nutmeg
2 large eggs
1/4 cup melted, unsalted butter
1/2 cup unbleached all-purpose flour
1/4 teaspoon salt
  confectioner's sugar (as garnish)