Preheat Oven – Preheat your oven to 350°F (175°C). Grease a loaf pan or line it with parchment paper.
Mix Dry Ingredients – In a large bowl, whisk together whole wheat flour, oats, flaxseeds, sunflower seeds, pumpkin seeds, salt, and baking soda.
Add Wet Ingredients – Pour in buttermilk, honey, and olive oil. Stir until just combined (do not overmix).
Transfer to Pan – Pour the batter into the prepared loaf pan and smooth the top.
Bake – Place in the oven and bake for 35-40 minutes, or until a toothpick inserted comes out clean.
Cool – Let it cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.