1. 1. Combine Dry Ingredients: In a large bowl, whisk together the all-purpose flour, salt, and instant yeast until well combined. This ensures even distribution of the yeast throughout the dough.

2. 2. Mix Wet Ingredients and Form Dough: In a separate medium bowl, gently whisk together the active sourdough starter and warm water. Pour the wet mixture into the dry ingredients. Using a wooden spoon or your hands, mix until a shaggy, sticky dough forms and all the flour is incorporated. Do not overmix; a few dry spots are fine.

3. 3. Add Inclusions and First Rise: Gently fold in the dried cranberries and chopped walnuts until they are evenly distributed. Cover the bowl tightly with plastic wrap or a damp kitchen towel. Let the dough rise at room temperature (around 68-72F) for 12-18 hours, or until it has doubled in size and looks bubbly. The exact time will depend on the temperature of your kitchen and the activity of your starter.

4. 4. Shape the Loaf: Lightly flour a clean work surface. Gently scrape the dough out of the bowl onto the floured surface. Using floured hands, gently shape the dough into a round or oval loaf. Avoid deflating it too much.

5. 5. Second Rise (Proofing): Place the shaped dough into a floured proofing basket (banneton) or a bowl lined with a floured kitchen towel, seam-side up. Cover loosely with plastic wrap or a towel and let it rise for another 1-2 hours, or until it looks puffy and springs back slowly when gently poked.

6. 6. Preheat Oven and Dutch Oven: About 30 minutes before baking, place a Dutch oven with its lid into your oven and preheat to 450 F (232 C). Getting the Dutch oven very hot is crucial for a great crust.

7. 7. Bake the Bread: Carefully remove the hot Dutch oven from the oven. Gently invert the proofed dough into the hot Dutch oven. If desired, score the top of the dough with a sharp knife or razor blade. Cover with the lid and bake for 30 minutes.

8. 8. Finish Baking: Remove the lid from the Dutch oven and continue baking for another 15-20 minutes, or until the crust is deeply golden brown and the internal temperature reaches 200-210 F (93-99 C).

9. 9. Cool Completely: Carefully remove the bread from the Dutch oven and transfer it to a wire rack to cool completely before slicing. This step is vital for the crumb to set properly and prevent a gummy texture.