In a large bowl or stand mixer bowl, mix your dough. Whisk together milk, sourdough starter, honey, sugar, egg, olive oil until smooth. Add in bread flour, salt, thyme, rosemary, and granulated garlic. Mix until a shaggy dough forms. Knead for 8–10 minutes in a mixer (or 12–15 by hand) until smooth and elastic. Add softened butter in 1-tablespoon pieces, kneading until fully incorporated.
3/4 cup (200g) bubbly sourdough starter, 1 1/4 cup (310g) whole milk, 1 Tablespoon (25g) honey, 2 1/2 Tablespoons (30g) granulated white sugar, 1 1/2 teaspoons (10g) sea salt, 1/4 cup (57g) unsalted butter, unsoftened, 2 teaspoons (10g) olive oil, 1 (50g) large egg, 4 1/4 cups (550g) bread flour, 1 teaspoon dried thyme, 1 teaspoon dried rosemary, 1 teaspoon granulated garlic