Homemade Vegan Burger Buns (soft + fluffy recipe!)

Ingredients

• 3.5 cups all-purpose unbleached flour (1.1 lb)
• 1 cup warm water
• 1 packet active dry yeast
• 2.5 Tbsp sugar
• 1 tsp salt
• 1/4 cup melted vegan butter (divided)
• 2 Tbsp plain, unsweetened non-dairy milk (room temperature)
• 1 tsp oil