01 -
Drain the canned peaches and pour them into a 9x13-inch baking dish. Sprinkle with 1/3 cup flour, 1/4 teaspoon each of cinnamon, nutmeg, and kosher salt. Gently stir to combine without bruising the peaches. Set aside.
02 -
Preheat the oven to 375°F. In a large bowl, combine the dry ingredients: flour, sugar, kosher salt, baking powder, cinnamon, and nutmeg. Whisk together evenly.
03 -
In a small bowl, whisk the egg yolk and buttermilk. Gradually pour the mixture into the dry ingredients, stirring with a pastry cutter or spoon until a shaggy dough forms. Pour the topping over the peaches in the baking dish.
04 -
Cut the butter into 1/2-inch pieces and scatter them over the topping. Sprinkle with 1 tablespoon sugar for caramelization. Bake at 375°F for 30-40 minutes, or until the top is uniformly golden brown and bubbling.