Combine warm water, 1 tablespoon sugar, and yeast in a large bowl. Stir gently and leave for 5–10 minutes until foamy. If no foam forms, start over with fresh yeast.
Add remaining sugar, salt, and softened butter to the yeast mixture. Add bread flour one cup at a time, stirring between additions. Turn dough onto a lightly floured surface and knead for 8–10 minutes until smooth and slightly tacky. Alternatively, use a stand mixer with a dough hook on medium for 6–7 minutes.
Place dough in a lightly oiled bowl, turn once to coat, and cover with plastic wrap. Leave in a warm spot for 1 to 1.5 hours until doubled in size.
Punch dough down and divide into 12 equal pieces. Roll each into a log about 8 inches long. Place on parchment-lined baking sheets 2 inches apart. Cover loosely and rest for 30 minutes until slightly puffed.
Preheat oven to 400°F. Bake for 14–16 minutes until pale golden on top. Do not overbake — breadsticks should stay soft, not turn dark or crusty.
Mix melted butter with garlic powder, salt, and parsley. Brush generously over breadsticks immediately as they come out of the oven. Serve warm.