01 - In a large mixing bowl, whisk together the all-purpose flour, instant yeast, granulated sugar, and kosher salt until evenly distributed.
02 - Pour the warm water (110°F) and olive oil into the dry mixture. Stir with a wooden spoon until a shaggy dough forms and no dry flour remains.
03 - Turn the dough onto a lightly floured work surface and knead firmly for 6 to 8 minutes, until the dough becomes smooth, supple, and springs back when gently pressed.
04 - Transfer the dough to a lightly greased bowl, turning once to coat. Cover tightly with plastic wrap or a damp kitchen towel and set in a warm, draft-free spot for 45 to 60 minutes, or until doubled in bulk.
05 - Preheat the oven to 400°F. Line a half-sheet baking pan with parchment paper and set aside.
06 - Gently punch down the risen dough to release excess gas. Divide into 12 equal portions. Roll each portion into a 7- to 8-inch rope, tapering the ends slightly, and arrange on the prepared baking sheet with about 1 1/2 inches of space between each.
07 - Loosely cover the shaped breadsticks with a towel and let rest for 15 minutes until slightly puffed.
08 - Bake on the center oven rack for 12 to 15 minutes, rotating the pan halfway through, until the breadsticks are golden brown and sound hollow when tapped on the bottom.
09 - While the breadsticks bake, whisk together the melted unsalted butter, minced garlic, dried parsley, garlic powder, and kosher salt in a small bowl until well combined.
10 - Immediately upon removing the breadsticks from the oven, brush each one generously with the garlic butter mixture using a pastry brush. Allow the butter to soak in for 1 to 2 minutes before serving warm.