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 whole wheat flour, bread flour, oats, sunflower seeds, flaxseeds, and salt.
- Combine and Knead: Add dry ingredients and olive oil to the yeast mixture. Stir until a shaggy dough forms. Knead on a floured surface for 8-10 minutes until smooth and elastic.
- First Rise: Place dough in a greased bowl, cover, and let rise in a warm place until doubled, about 1 to 1.5 hours.
- Shape the Batard: Punch down dough and shape into an oval loaf (batard shape) about 12 inches long. Place on a parchment-lined baking sheet.
- Second Rise: Cover and let rise for another 30-45 minutes until puffy.
- Preheat Oven: Preheat oven to 425°F (220°C). Place a shallow pan of water on the bottom rack for steam.
- Score and Bake: Score the top of the batard with a sharp blade. Bake for 30-35 minutes until golden brown and crusty.
- Cool: Remove from oven and cool completely on a wire rack before slicing.