One 14-ounce can sweetened condensed milk, unopened, label removed
1 cup (5 1/2 ounces) hazelnuts, blanched and chopped
2 cups unbleached all-purpose flour
1 1/4 teaspoons kosher salt
1 teaspoon ground cinnamon
1/4 teaspoon ground cloves
2 sticks (1 cup) unsalted butter, at room temperature
1 cup confectioners' sugar
1 tablespoon finely grated orange zest (from about 2 oranges)
2 teaspoons pure vanilla extract
1 teaspoon pure maple extract