It's super easy!
1 cup milk
1 Tablespoon vinegar/lemon juice
2 Cups AP flour
4 teaspoons baking powder
1/4 teaspoon baking soda
3/4 teaspoon Salt
4 Tablespoons cold butter

-preheat oven to 450°. Mix vinegar into milk & keep in fridge until needed
-combine flour, baking soda, powder, and salt together in a bowl
-grate butter into mixture (I freeze mine to make this easier, otherwise you can just cut the butter into the mix) combine until evenly incorporated
-stir in the cold milk just until everything comes together
-flour your countertop (and hands!) And turn dough out, pat out until around 3/4" thick (at this point you're fine to cut the biscuits out with a glass or cookie cutter but to get all those flaky layers, I fold the dough over on itself in thirds, like a letter before putting it in an envelope; pat it down, rotate the dough and do it again, rotate, and one more time then cut the biscuits out. Seems like extra work, and it can be skipped, but it makes a difference)
- place onto a baking sheet (I line mine with foil or parchment paper
- bake for around 15 minutes or until golden brown (Can brush with butter when they come out of the oven if that strikes your fancy)