Mix warm water, yeast, and 1 tsp sugar; let rest 5-7 min.
Add flour, salt, oat milk, and vegan butter; knead for 12-15 min. Cover and let rise 45-60 min.
Roast garlic: Wrap garlic bulb in foil, drizzle with olive oil, roast at 400°F for 40 min. Cool, squeeze out cloves, mash.
Roll out dough, spread with garlic butter, cut into 12 squares, and stack in a greased pan. Bake at 350°F for 50 min, tent if needed. Brush with melted butter and sprinkle herbs before serving.