Gather all ingredients.
Combine milk and vinegar in a medium bowl and set aside for 5 minutes to make sour milk.
Combine flour, sugar, baking powder, baking soda, and salt in a large mixing bowl.
Whisk egg and butter into soured milk.
Pour flour mixture into milk mixture and whisk until lumps are gone.
Heat a large skillet over medium heat, and coat it with cooking spray.
Pour ¼ cupfuls of batter onto the skillet, and cook until bubbles form and the edges are dry, about 2 to 3 minutes.
Flip with a spatula, and cook until browned on the other side.
Repeat with remaining batter.