If you do not have buttermilk, you can create a buttermilk substitute with 1 3/4C whole milk and 2Tbsp vinegar. Just pour vinegar into the milk and let sit while you mix the other ingredients. Milk will be slightly chunky. Dump everything in the mix.
Preheat oven to 450deg.
Place butter in 8X8 baking dish and put in oven to melt (or butter can be melted in the microwave and poured into baking dish). Remove when butter is melted.
In medium mixing bowl thougherally combine dry ingredients.
Add Buttermilk (or buttermilk substitute).
Mix gently until ingredients are loosely mixed. Lumps are ok. It will look a hot mess, that's fine!
Pour mix into 8X8 pan, spread to edges of pan. Do not mix with butter, allow the butter to run over the top of the mix. Again, Its fine that it looks like a mess!
Bake 20-25 minutes or until a knife comes clean out of the biscuits. Cool slightly, cut into squares and serve as desired.