Make the oatmeal porridge: Combine the oats and water in a small saucepan. Bring the mixture to a boil over medium heat. Continue cooking until the liquid is absorbed and the oats are soft and have puffed up, about 5 minutes. Transfer to a bowl and let the porridge cool completely before adding it to the dough.
50 grams old fashioned oats, 226 grams water
Make the dough: Whisk the water, molasses and yeast together in a glass measuring cup. Cover with plastic wrap and let the yeast bloom until fragrant and foamy, about 15 minutes.
226 grams water, 42 grams molasses, 7 grams active dry yeast
Combine the cooled porridge, yeast mixture and sourdough discard in the bowl of a stand mixer fitted with a dough hook. Mix until no traces of starter remain.
113 grams sourdough discard
Add the remaining dough ingredients into the bowl and continue mixing until a cohesive dough forms. Knead with the dough hook for 5 to 10 minutes until it pulls away from the sides and clings to the dough hook, it should be smooth and pliable.
120 grams whole wheat flour, 480 grams all-purpose flour, 15 grams cocoa powder, 12 grams salt
Turn the dough out on a clean work surface, knead lightly and round it into a tight ball. Transfer the dough to a lightly-oiled bowl and cover with plastic wrap.
Let the dough rise: Let the dough rise untouched in a warm spot until doubled in volume, about 30 minutes to 1 hour, depending on the temperature of your kitchen.
Line a large baking pan (18 by 13 inches) with parchment paper.
Shape the dough: Turn the dough out on a clean work surface. Flatten into a rectangle and divide it into 15 portions, using a bench scraper. Cover the pieces with plastic wrap to prevent them from drying out.
Take one portion and flatten it into a rough rectangle. Fold the corners towards the center and pinch to seal. Turn the dough seam-side down and drag it in a circular motion until it forms a tight ball. Transfer the dough to the prepared baking pan. Repeat with the remaining portions of dough.
Final proof: Cover the pan with plastic wrap and let the dough rise undisturbed until puffy and nearly fills the pan. The rolls should be lightly touching by the end of the rise, about 30 minutes to 1 hour.
Prep: Preheat the oven to 375 F. Whisk the egg. Brush the tops of the dough with egg wash. Sprinkle an even layer of oats on top of the dough.
egg, old fashioned oats
Bake: Bake the dough for 30 to 45 minutes or the rolls register 190 F when probed with an instant-read thermometer.
Enjoy and store: Transfer the baked rolls to a wire rack. These are best enjoyed the day they are baked but can be stored in a ziplock bag at room temperature for up to 3 days.