Preheat your oven to 180C (350F) and line a loaf pan with parchment paper (or grease with butter). I've used a glass pan measuring 1.5L 28cm x 11cm or 1.6QT 11.1" x 4.5" to bake this, but it works very well in a metal or aluminium tin also.
To a large mixing bowl, add all of the dry ingredients (all purpose flour, baking powder, salt, poppy seeds, sesame seeds, flax seeds, pumpkin seeds and rolled oats). Mix well to combine and set aside.
Now take another mixing bowl and add all of the wet ingredients to the bowl (sourdough starter, eggs, maple syrup, natural yogurt, whipping cream, EVOO and brown sugar). Whisk to combine and form a runny liquid where the sugar is completely dissolved.
Pour the wet ingredients onto the dry ingredients. Gently stir to moisten the dry ingredients with the wet ingredients. Do not over mix. You just want to moisten the dry ingredients.
Pour the batter into your prepared loaf pan and place in the oven for 1 hour or until the top is golden brown and a toothpick comes out clean.
When the seedy sourdough breakfast loaf is done, remove from the oven and allow the loaf to cool in the pan for 5 to 10 minutes. Then transfer to a wire rack to fully cool.