1. Activate the Yeast: In a large mixing bowl, combine the warm water, active dry yeast, and granulated sugar. Stir gently and let it sit for 5-10 minutes until the mixture becomes foamy. This foaminess indicates that your yeast is active and ready to work its magic.

2. Combine Wet Ingredients: Add the salt, olive oil, and active sourdough starter to the foamy yeast mixture. Stir everything together until well combined. The starter will begin to integrate, giving your dough that characteristic sourdough flavor.

3. Mix and Knead the Dough: Gradually add the all-purpose flour, one cup at a time, mixing with a wooden spoon or a stand mixer with a dough hook until a shaggy dough forms. Once all the flour is incorporated, turn the dough out onto a lightly floured surface and knead for 5-7 minutes. The dough should become smooth and elastic, bouncing back slightly when poked.

4. First Rise: Lightly grease a clean large bowl with olive oil. Place the kneaded dough in the bowl, turning it once to coat all sides. Cover the bowl with plastic wrap or a clean kitchen towel and let it rise in a warm place for 1.5 to 2 hours, or until it has doubled in size. This is where the sourdough magic truly begins to develop.

5. Shape the Bread Bowls: Gently punch down the risen dough to release the air. Divide the dough into 4 equal portions. On a lightly floured surface, shape each portion into a round ball. Place the shaped dough balls on a baking sheet lined with parchment paper, leaving some space between them.

6. Second Rise and Preheat Oven: Cover the shaped dough balls loosely with plastic wrap or a clean towel and let them rise for another 20-30 minutes while you preheat your oven to 375 F (190 C). This short second rise helps them get their final structure before baking.

7. Bake to Golden Perfection: Bake the bread bowls in the preheated oven for 25-30 minutes, or until they are golden brown on top and sound hollow when tapped on the bottom. The internal temperature should reach around 200-210 F (93-99 C).

8. Cool and Hollow Out: Once baked, transfer the bread bowls to a wire rack to cool completely. Once cool, use a sharp serrated knife to carefully cut a circle from the top of each bread bowl, creating a lid. Scoop out some of the soft interior bread, leaving a sturdy wall of about 1/2 to 3/4 inch thick. Reserve the scooped-out bread for dipping!