Preheat the oven to 450°F. Line a baking sheet with parchment paper.
Mix the milk and apple cider vinegar together. Set aside for 5 minutes.
Add flour, baking powder, sugar, baking soda, and salt to a food processor. If you don't have a food processor, add the ingredients to a large bowl.
Mix the ingredients together by pulsing in the food processor or whisking.
Add the cold butter to the food processor or bowl. Process until the mixture is a sandy texture. Or, use a fork or pastry cutter to break the butter down until small (pea-sized or less) pieces.
Add in the buttermilk ⅓ cup at a time. Process or mix until just incorporated.
Scoop the mixture (about ¼ cup worth) into mounds on the baking sheet. Leave a couple inches of room between the biscuits.
Bake for 12-14 minutes or until golden brown.
Remove from the oven and brush some melted butter onto each biscuit.
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