Preheat the oven to 180ºC. Line a Le Creuset 24cm Signature Round Casserole with baking paper and drizzle with olive oil. Set aside.
Add all the dry ingredients in the bowl of a stand mixer fitted with the dough hook, and slowly add the buttermilk until a dough forms. Knead the dough until soft and smooth. Place into your prepared casserole and score a cross on the top. Top with oats and bake for 1 hour. Remove the lid and bake for a further 15 minutes until golden brown on top and a skewer comes out clean
While the bread bakes, make the butter. Whip soft butter, salt, and honey together until pale and smooth. Set aside.
To test if the bread is ready, remove the loaf from the casserole and tap the bottom of the bread. It should sound hollow when tapped underneath. Serve the bread warm with honey butter.