In a large mixing bowl, whisk together the sourdough discard, milk, egg, vanilla, melted butter, and coconut sugar until smooth.
Sift in the whole spelt flour, baking powder, baking soda, and salt to avoid any large chunks of flour. Whisk until just combined and no pockets of flour remain.
Heat a large frying pan over medium-low heat. Add some butter to the warm pan and use a spatula to spread it over the surface of the pan as it melts. Scoop the pancake batter into the hot pan. Cook for 2-3 minutes per side.
Serve the sourdough discard pancakes warm with the toppings of your choice. My favourites are maple syrup, Skyr yogurt, and fresh fruit.