Preheat the oven to 375 degrees F and grease or line with muffin liners a muffin tin. Set aside. In a large bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and cinnamon. Set to the side.
280 grams all-purpose flour, 200 grams white sugar, 10 grams baking soda, 8 grams baking powder, 6 grams salt, 9 grams ground cinnamon
In a medium bowl add the eggs, pumpkin puree, melted butter, and sourdough discard. Whisk until the ingredients are combined and smooth.
150 grams eggs, room temperature, 425 grams pure pumpkin puree, canned, 113 grams unsalted butter, melted, 260 grams sourdough discard
Gradually add the dry ingredients to the wet ingredients and mix until just combined. Don't over-mix the batter, as this can lead to dense Sourdough Pumpkin Muffins.
Finally, fold in the mini chocolate chips.
270 grams mini chocolate chips
Long Fermentation Tip: To long-ferment the batter, cover the batter and place it in the fridge overnight. The following day, pull the batter out and allow it to come to room temperature before baking. Or bake from cold, but you might need to add a minute or two to the bake time.
Scoop the batter into the prepared muffin tin until about 3/4 way full.
Bake for 17-18 minutes, or until a toothpick comes out mostly clean.
Cool on a wire rack for 10 minutes before serving. Enjoy!