Za'atar Swirl Bread

Ingredients

• 2 cups (250g) whole wheat flour
• 2 1/4 to 2 1/2 cups (286 to 318g) bread flour, divided
• 1 tablespoon (12g) granulated sugar
• 1 (0.25oz) package (7g) or 2 1/4 teaspoons Platinum Yeast
• 1 tablespoon (9g) kosher salt (see note)
• 1/2 tablespoon (1g) za'atar seasoning
• 2 tablespoons (28g) extra-virgin olive oil
• 1 1/2 cups (360g) warm water (120°F/49°C to 130°F/54°C)
• 1 (50g) large egg, room temperature and lightly beaten
• 4 1/2 tablespoons (9g) za'atar seasoning
• 1/4 cup (56g) extra-virgin olive oil