Whole Wheat Sables With Za'atar Recipe

Ingredients (8)

• 8 tablespoons unsalted butter, at room temperature
• 2 tablespoons sugar
• 1/2 cup whole wheat flour
• 1/2 cup all purpose flour
• 1/2 teaspoon kosher salt
• 1 teaspoon milk
• 1 egg beaten with 1 teaspoon water, for egg wash
• About 4 tablespoons za'atar (see note)