Feed Your Starter: Feed your gluten-free sourdough starter 4 to 12 hours before mixing. Ensure it's bubbly and expanded with a pleasant sour smell.
Mix the Dough: In a stand mixer bowl, combine flour, starter, salt, and 1 cup of water. Mix on low then medium until large crumbles form. Add more water 1 tsp at a time if needed until no dry patches remain. Dough should be dry, not sticky.
Knead Lightly: Use hands to gently press dough into a smooth ball. No intensive kneading required.
Shape the Loaf: Form the dough into a 6-inch round disk on parchment paper.
First Rise (Bulk Fermentation): Transfer dough (on parchment) to a bowl, cover, and let rest at room temperature for 6 to 12 hours. Expect minimal rise.
Cold Fermentation (Optional): Move covered dough to fridge for 3 to 12 hours for deeper flavor and structure.
Preheat Oven and Dutch Oven: Place Dutch oven in your oven and preheat both to 425°F (220°C) for at least 45 minutes.
Final Warm-Up: Remove dough from fridge and let sit at room temperature for 1 hour.
Score the Dough: Use a lame or sharp knife to slash the top. A single center slash works well.
Bake with Steam: Place dough with parchment into Dutch oven. Cover and bake for 35 minutes.
Finish Baking Uncovered: Remove lid, reduce oven to 400°F (205°C), and bake for 25–30 more minutes until deep golden and crisp.
Cool Completely: Let loaf cool on a wire rack for at least 1 hour before slicing.