Warm milk to about 110°F (43°C) until it feels warm but not hot. Pour into a large mixing bowl, sprinkle yeast over milk, add 1 tablespoon of sugar, and let sit for 5-10 minutes until foamy.
Add cooled melted butter, eggs, and apple cider vinegar to the yeast mixture. Whisk together until well combined and slightly frothy.
In a separate bowl, whisk together the gluten free flour blend, remaining sugar, and salt until well aerated and free of clumps.
Gradually add dry ingredients to wet, mixing on low speed with a stand mixer or by hand. Mix until fully incorporated and dough is thick and slightly sticky.
Cover bowl with plastic wrap or a damp kitchen towel. Place in a warm spot and let rise for about 1 hour, or until roughly doubled in size.
Lightly grease a 9x13 inch baking dish. Using wet hands or a greased ice cream scoop, divide dough into 12 equal portions, shape into balls, and place in dish with space between each.
Cover shaped rolls loosely and let rise again for 30-45 minutes until puffy. While rising, preheat oven to 375°F (190°C).
Remove covering and bake rolls for 20-25 minutes until golden brown and a toothpick inserted in center comes out clean. Tent with foil if tops brown too quickly.
Brush tops generously with melted butter as soon as they come out of the oven. Let cool in dish for about 10 minutes before serving warm.