1. 1. Combine Wet Ingredients: In a large mixing bowl, gently whisk together your active sourdough starter, warm water, honey, and olive oil until well combined. The mixture should look slightly milky and have a faint bubbly appearance from the starter.

2. 2. Add Dry Ingredients: To the wet mixture, add the whole wheat flour, all-purpose flour, rolled oats, and salt. Use a sturdy spoon or your hands to mix everything until a shaggy, cohesive dough forms. Make sure there are no dry pockets of flour remaining.

3. 3. First Knead and Rest: Turn the dough out onto a lightly floured surface. Knead the dough for about 5-7 minutes until it starts to become smoother and more elastic. It might be a bit sticky at first, but resist the urge to add too much extra flour. Place the dough back into a lightly oiled bowl, cover it with plastic wrap or a damp kitchen towel, and let it rest at room temperature for 4-6 hours. During this bulk fermentation, the dough should visibly increase in size, usually by about 50-75%, and you’ll see small bubbles forming on the surface.

4. 4. Shape the Loaf: Gently turn the dough out onto a lightly floured surface. Lightly flatten it into a rectangle. Fold the top third of the dough down to the center, then fold the bottom third up over the top. Turn the dough over and gently roll it into a log shape, creating tension on the surface. Pinch the seams together to seal.

5. 5. Second Rise (Proofing): Lightly grease a 9×5-inch loaf pan. Carefully transfer the shaped dough into the prepared loaf pan, seam-side down. If desired, lightly mist the top of the dough with water and sprinkle with a few extra rolled oats for a decorative finish. Cover the pan loosely with plastic wrap or a damp towel and let it rise in a warm spot for 1.5-2.5 hours. The dough should look puffy and almost double in size, reaching just above the rim of the pan. An easy test is the “poke test”: gently poke the dough with a floured finger; if the indentation springs back slowly, it’s ready. If it springs back immediately, it needs more time.

6. 6. Preheat Oven and Bake: Preheat your oven to 400F (200C) about 20 minutes before the proofing time is complete. Once the oven is hot and the dough is proofed, place the loaf pan in the preheated oven. Bake for 35-40 minutes, or until the crust is golden brown and the internal temperature reaches 200-210F (93-99C) when measured with an instant-read thermometer.

7. 7. Cool Completely: Once baked, immediately remove the bread from the loaf pan and place it on a wire rack to cool completely. This step is crucial for the bread’s texture; slicing it too early can result in a gummy interior. Allow it to cool for at least 1-2 hours before slicing and serving.