Preheat the oven to 325
On the stove or in the microwave, melt the butter.
In your mixing bowl, stir together the sourdough starter, cheese, salt, and melted butter until smooth.
Place a piece of parchment paper onto your baking sheet, making sure to cover the whole thing.
Spread the cracker mixture out on the parchment paper into a thin layer. You want it to be really thin, and as even as you can get it. Sprinkle additional salt, and any extra seasonings or herbs that you would like on top of the crackers.
Bake in the preheated oven for 7 minutes.
Remove the pan, and using a pizza cutter or sharp knife, roughly score the crackers into squares. It doesn't have to be perfect, the crackers will separate as they cook.
Put the crackers back in the oven, and cook for 20-30 minutes, rotating once in the middle. You will need to keep an eye on them! Depending on the size of pan you used, how thick the crackers are, and oven temperature they may cook a little faster or slower. You want them to be nice and golden brown for crunchy crackers.
Remove from the oven, and allow to cool completely on the pan.
Store in an airtight container on the counter for up to a week. I like to use a glass Tupperware, or a glass jar. You can also freeze for longer!