Preheat the oven to 425ºF. Line a baking sheet with parchment paper.
In a large bowl, mix together the flour, salt, baking soda and baking powder. 1 cup all-purpose flour, ¼ teaspoon salt, ½ teaspoon baking soda, 1 ½ teaspoons baking powder
Cut in the butter until the mix resembles coarse crumbs. It’s ok if there are still little chunks of butter. This will help create flaky layers. ½ cup salted butter,
Add the starter and mix until barely combined. Do not overmix. 1 cup sourdough discard
Turn the dough out onto a floured pastry mat and pat it into a horizontal rectangle that is about 1 1/2 inches thick. Fold the left side of the rectangle over the right side and pat it out into a vertical rectangle. Fold the bottom half up to the top and press it out into a horizontal rectangle again. Repeat the steps above 3 times for a total of 6 folds. Be careful not to overwork the dough while you are doing this. The folding is what creates the pretty layers. Sprinkle a little flour on the layers if the dough starts getting sticky, but just pat gently and handle the dough lightly.
After 6 folds, gently pat the dough into a rectangle that is about 1 1/4" inch thick. Use a sharp circle biscuit cutter and press down through the dough, then lift up. Do not twist the cookie cutter or shuffle it around. Just push down, then pull straight up.
Place biscuit on the prepared baking sheet. Brush the tops of the biscuits with melted butter. 2 tablespoons salted butter
Bake at 475 degrees Fahrenheit for 5 minutes, then reduce the heat to 425 degrees Fahrenheit (without opening the oven) and bake for an additional 10 minutes.
Allow the biscuits to sit for 2-3 minutes before serving. Serve warm.
Notes
If you can't bake the biscuits right away, store the dough in the fridge to keep the ingredients as cold as possible.
Add shredded cheddar cheese to the dough for cheddar biscuits.
The calories shown are based on the recipe making 6 biscuits, with 1 serving being 1 biscuit. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**