10:00 PM – Levain Initialization: In a clean glass jar, whisk the 7g of starter culture into 35g of room-temperature water. Add 35g of bread flour and stir until a smooth paste forms. Cover loosely and leave at room temperature 74–78°F (23–26°C) overnight for 8 to 10 hours until it bubbles and triples in volume.

The Oatmeal Scald: In a small saucepan or heatproof bowl, combine 40g of rolled oats and 120g of boiling water. Stir thoroughly, cover, and let it sit overnight at room temperature to absorb all the liquid, cool down completely, and form a thick, gelatinized porridge cream.

8:00 AM – The Porridge Autolyse: In your stand mixer bowl, combine all 115g of water, 15g of honey, 70g of active overnight levain, and all of the cooled oatmeal porridge base. Whisk briefly to break up the porridge, then stir in all 300g of bread flour using a heavy spoon until a thick, shaggy dough mass forms. Cover and let rest for 1 full hour to hydrate the proteins and soften the oat fibers.

9:00 AM – Primary Gluten Mixing: Secure the bowl onto your stand mixer fitted with the dough hook. Knead on low speed for 3 to 4 minutes (KitchenAid speed 3) until the dough develops a uniform, cohesive structure. Sprinkle the 6g of fine sea salt across the surface and continue mixing for 2 minutes.

Butter Emulsification: Turn the mixer up to medium speed and add the 30g of softened unsalted butter one small chunk at a time. Once all the butter is introduced, mix continuously for 8 to 10 minutes. The sticky dough will gradually absorb the fat, clearing cleanly from the bottom and sides of the mixing bowl to reveal a smooth, highly elastic surface.

The Windowpane Test: Wet your fingers, pinch a small corner of the dough, and pull it gently upward. It should stretch into a paper-thin, semi-translucent sheet without snapping, proving the gluten mesh is completely developed.

Bulk Proofing Window: Cover the bowl tightly and leave it to ferment at a warm room temperature for 3.5 to 4 hours. Perform 2 gentle rounds of stretch-and-folds during the first 2 hours to organize the dough's internal strength. By the end of the proof, the dough should feel pillowy, light, and visibly aerated.

1:00 PM – Cold Fermentation Retard: Seal the container tightly and slide it directly into your refrigerator. Leave it to rest slowly for 10 to 14 hours to solidify the butter fats and mature the dough structure for clean shaping.

10:00 PM – Rolling and Tension Shaping: Remove the cold, firm dough from the refrigerator and tip it cleanly onto a lightly floured counter. Using a rolling pin or your palms, flatten the cold dough into a long, uniform rectangle. Fold the left and right sides slightly inward to match the exact length of your 9x5 loaf pan, then roll the dough tightly from top to bottom into a compact, high-tension log.

Pan Placement & Oat Topping: Line the base of your 9x5 inch loaf pan with parchment paper. Spray the top crown of your shaped log lightly with water, roll or press extra raw rolled oats firmly over the damp surface to adhere, and drop the log seam-side down into the pan.

The Overnight Room Rise: Cover the loaf pan loosely with plastic wrap or an inverted bowl. Let it proof overnight on your kitchen counter for 8 to 10 hours at a stable room temperature around 70–74°F (21–23°C). The wild yeast will lift the heavy porridge structure slowly, allowing the dough to double in size and crest beautifully above the pan rim by morning.

7:00 AM – The Sandwich Bake: Preheat your home oven to 375°F (190°C). Slide the risen loaf pan directly onto the center oven rack and bake for 35 to 40 minutes. The oat-crusted top crown should puff into a rich, deep golden-brown hue.

Cooling Cycle: Carefully turn the hot bread out of the loaf pan onto a wire cooling rack. Let it cool down completely for at least 2 hours before slicing to allow the internal crumb structure to set perfectly.