Mix the flour, salt, baking powder and sugar together in a medium bowl.
Mix the sourdough discard and heavy cream together in a small bowl.
Gently mix the wet into dry until just combined.
If you want smaller biscuits, aim for 2 tablespoon size, if you want large biscuits, aim for ¼ cup. I use a portion scoop. They'll get quite big from original little dough ball size. Give them an inch or so space between.
It will make about 12-16 large or 2 dozen smaller biscuits. I prefer smaller biscuits when I'm serving a bunch of kids or a crowd. I'd rather people took thirds vs see half ate biscuits on plates. However, I can't say I've ever seen a half ate biscuit?
Bake for 10-15 minutes, depending on your biscuit size, you want them lightly browned on top.