Pre-heat the oven to 175°C (350°F) and grease/line a 23cm x 12½xm (9" x 5") loaf tin.
Melt the butter and set to one side.
In a large bowl, beat the egg and add the Greek yoghurt, milk and cooled butter.
In a separate bowl, mix the flour, baking powder, baking soda, paprika and chilli powder together.
Add the dry ingredients to the wet and stir everything together (don't over mix).
Stir in the cheese and jalapeño, just until combined.
Pour into the prepared loaf tin and sprinkle with a little extra cheddar and jalapeño slices.
Bake for around 35-40 minutes (start to check at the 30 minute mark).
The bread is ready when an inserted skewer comes out clean.
Leave to cool a little, but eat warm with tonnes of butter. Enjoy!