Preheat the over to 180°C / 160°C fan / Gas Mark 4 and line a 12 hole muffin tin with paper cases.
In a jug, whisk together butter, eggs, yoghurt, honey and vanilla extract.
In a large bowl, mix together flour, baking powder, bicarbonate of soda, cinnamon and salt with the rolled porridge oats.
Fold the wet ingredients into the dry ingredients, being careful to not overmix the batter. Finally, fold in the berries. Divide the batter between the 12 muffin cases and top with a few oats and seeds on each.
Bake in the oven for 20-25 minutes until golden, risen and a skewer inserted into the middle comes out clean. Pop the paper cased muffins out of the tin to cool on a wire rack.