Combine milk with vinegar in a medium bowl and set aside for 5 minutes to "sour". It will look curdled.
Combine flour, sugar, baking powder, baking soda, and salt in a large mixing bowl. Whisk eggs and butter into "soured" milk. Pour the flour mixture into the wet ingredients and whisk until lumps are gone. Do not overmix!
Heat a large skillet over medium heat, and coat with cooking spray or you can use butter. Pour 1/4 cupfuls of batter onto the skillet, and cook until bubbles appear on the surface. Flip with a spatula, and cook until browned on the other side. Serve with syrup, fruit, or whipped cream.
Video
Notes
Make sure you use medium heat. If your pan is too hot the outside will still brown but the inside will be runny. A lower heat is better to cook the inside. Source: adapted from Allrecipes