Preheat the oven to 350°F. Line a cookie sheet with a sheet of parchment paper and set aside.
In a large mixing bowl using electric beaters, beat the butter, milk, sugar, vanilla, and vinegar. (Alternatively, you can use a stand mixer.)Mix until well combined and the sugar has almost dissolved, about 3 minutes.
In a different bowl, whisk the flour, baking powder, baking soda, and salt until combined.
Slowly add the dry ingredients to the wet mixture, about ½ cup at a time, until fully combined.
Using a spatula, gently fold in 3 tablespoons of sprinkles. This method will help to prevent color bleeding.
Using a cooke scoop of spoon, scoop about 1 ½ tablespoons of cookies dough and place on the prepared cookie sheet. Slightly press down on the cookie dough ball with the palm of your hand. Repeat with the remaining dough.
Use the remaining 1 tablespoon of sprinkles to decorate the tops of all the cookie dough.
Bake for 10 minutes until the edges are just starting to turn golden brown.
Remove the cookies from the baking sheet and place on a wire cooling rack. Allow to cool for about 5 minutes before serving.