Preheat oven to 425°F. Line a baking sheet with parchment paper.
In a large bowl, mix together the flour, baking powder, salt, garlic powder, onion powder, and cayenne pepper.
Add the shredded cheddar cheese and chives (if using) and stir to combine.
Melt the butter, then add the melted butter and sourdough discard to the bowl. Mix until everything is fully combined.
Using an ice cream scoop or large spoon, scoop the dough onto the prepared baking sheet.
Bake for about 14 minutes, or until the biscuits are golden brown.
Remove from the oven and brush with additional melted butter. Sprinkle with parsley before serving.