In a separate bowl, add the flour, rolled oats, brown sugar, cinnamon and salt. Whisk until combined. With a pasty cutter, cut the cold butter into the flour mixture until the butter is crumbly and in small pieces. Finally, pour and mix in the sourdough discard.
100 grams sourdough discard, 45 grams rolled oats, 140 grams all-purpose flour, 110 grams brown sugar, 1 grams ground cinnamon, 1 gram salt, 72 grams unsalted butter, cold + cubed