INGREDIENTS
1/2 cup
Rolled oats, old-fashioned
1 1/2 cups
All-purpose flour
10 oz
Bittersweet chocolate
2/3 cup
Confectioner's sugar
1/4 cup
Cornstarch
1/2 tsp
Salt
1
chilled and cut into thick 8-inch-thick slices 14 tablespoons unsalted butter, unsalted
1/2 cup
Finely chopped toasted piachios