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Preheat oven to 175°C. Lightly grease a baking sheet with olive oil.
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Boil the potatoes for the mash until they are very soft, drain well and mash with 1 tbsp olive oil until nice and smooth.
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In a large mixing bowl, stir the mashed potato into the grated potato, then stir in the egg, egg white, olive oil, and milk until well combined.
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In another medium bowl, stir the sesame seeds, sunflower seeds, pumpkin seeds, linseeds, whole wheat flour, cornflour, baking powder, and salt together.
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Add the dry ingredients to the wet ingredients and stir until the mixture comes together to form a soft dough, it will be a little bit sticky but you should be able to gently form it into a rough ball.
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Place the dough on the baking sheet and gently press it into a 9 x 8 inch oval. Using a sharp knife, cut a large "X" into the top of the dough.
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Bake for about 45 minutes until nicely golden brown. It should sound hollow when tapped.
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Once cooked, remove from the oven and let the bread sit on the baking sheet for 5 minutes before placing on a cooling rack to cool completely. Allow to cool for about 1 hour before slicing.