Pre-heat the oven to 200°C.
Mix together the dry ingredients.
In a separate bowl, whisk together the egg and other wet ingredients, along with the jalapeños, then stir into the dry ingredients.
Melt the 15g butter in a skillet (mine is 24cm). Swirl so that the butter reaches the sides, too. Pour out the batter into the skillet, smoothing to make the top fairly flat.
Sprinkle some cheese over the top, and bake for around 20 minutes, until golden. An inserted skewer will come out clean when ready. Serve warm. Enjoy!