Activate Yeast: In a large bowl, combine warm water, yeast, and honey. Let sit for 5-10 minutes until foamy.
- Mix Dry Ingredients: In another bowl, whisk together bread flour, whole wheat flour, oats, sunflower seeds, flaxseeds, and salt.
- Combine and Mix: Add dry ingredients and olive oil to the yeast mixture. Stir until a wet, sticky dough forms.
- Bulk Fermentation: Cover the bowl and let dough rise at room temperature for 1 to 1.5 hours, until doubled in size.
- Stretch and Fold: Perform 3 sets of stretch and folds every 20 minutes to develop gluten.
- Shape Loaf: Turn dough onto a well-floured surface, shape into an elongated oval (ciabatta shape) without deflating too much. Place on a parchment-lined baking sheet.
- Final Proof: Cover and let rise for 30-45 minutes until puffy.
- Preheat Oven: Preheat oven to 450°F (230°C). Place a baking stone or heavy baking sheet inside to heat, and place a pan of water at the bottom for steam.
- Bake: Transfer dough on parchment onto the hot baking stone. Bake for 25-30 minutes until golden brown and crusty.
- Cool: Remove bread from oven and cool completely on a wire rack before slicing.