Combine the milk and vinegar together. Let it rest 5 minutes. This is essentially making buttermilk (never buy buttermilk again!)

Combine dry ingredients in a large bowl.

Whisk egg and butter together with the buttermilk.

Pour the flour mixture into the buttermilk mixture and whisk until smooth.

Heat a large skillet pan over medium heat, and melt a bit butter for cooking. Pour batter onto the skillet (about 1/4 cup), and cook until bubbles appear on the surface. Flip with a spatula, and cook until browned on the other side.