"Recipe from: Baking Illustrated..."
INGREDIENTS
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3 cups (15 oz.) all-purpose flour, plus more for the work surface
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1 tbsp. instant or active dry yeast
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¼ cup (1¾ oz.) sugar
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1¼ tsp. salt
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1¼ cups whole milk, cold
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2 tbsp. unsalted butter room temperature
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24 tbsp. cold, European-style butter (like Plugra) cut into 1-tablespoon pieces
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2 tbsp. all-purpose flour
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1 large egg, lightly beaten
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Flaky Sea Salt (optional)