01 - In a large mixing bowl, whisk together the all-purpose flour, instant yeast, granulated sugar, and kosher salt. Pour in the warm water and olive oil, stirring until a shaggy dough comes together.
02 - Turn the dough onto a lightly floured work surface and knead firmly for 6 to 8 minutes, until the dough is smooth, supple, and springs back when pressed.
03 - Transfer the dough to a lightly greased bowl, cover tightly with plastic wrap or a damp towel, and let it rest in a warm draft-free spot for 45 to 60 minutes until doubled in volume.
04 - Preheat the oven to 400°F. Line a half-sheet baking pan with parchment paper and set aside.
05 - Gently punch down the risen dough to release trapped air. Divide it into 12 equal portions and roll each into a slender rope about 7 to 8 inches long. Arrange them on the prepared baking sheet with even spacing.
06 - Loosely cover the shaped breadsticks with a clean towel and allow them to puff up for 15 minutes.
07 - Bake on the center rack for 12 to 15 minutes, rotating the pan halfway through, until the breadsticks are deeply golden brown on top.
08 - While the breadsticks bake, stir together the melted unsalted butter, finely minced garlic, dried parsley, garlic powder, and kosher salt in a small bowl.
09 - As soon as the breadsticks come out of the oven, brush them generously on all sides with the garlic butter mixture. Serve warm.