Preheat and Prepare: Preheat your oven to 400°F. Line a piece of parchment paper large enough to fit inside a Dutch oven and set it aside.
Mix the Dry Ingredients: In a large mixing bowl, whisk together the flour, baking soda, and sea salt until well combined.
Add the Wet Ingredients: Pour the buttermilk and melted butter into the bowl. Stir with a wooden spoon until a shaggy dough begins to form.
Add Your Favorite Mix-Ins: Fold in your chosen add-ins, such as cheddar and Italian seasoning, olives and feta, or any other combination you like. Stir just until everything is evenly incorporated without overmixing.
Shape the Dough: Turn the dough out onto the prepared parchment paper. Using lightly floured hands, gently shape it into a round ball.
Score and Bake: Use the parchment paper to lift the dough into a Dutch oven. Score the top with a sharp knife to help the bread bake evenly. Cover with the lid and bake for 50–55 minutes, or until the crust is golden brown and the bread sounds hollow when tapped.
Cool Before Slicing: Carefully lift the bread out of the Dutch oven using the parchment paper. Let it cool for about 30 minutes before slicing and serving.