Here's a yummy sourdough recipe to add to your collection. It's very tasty and fun to make in my cast iron kettle. This is a slightly adapted recipe found on King Arthur Flour.
1 cup FED sourdough starter
1 cup warm water
3 1/2 cups flour
1 cup old fashioned oats
1/2 cup sunflower seeds
2 teaspoons salt
1 teaspoon instant yeast
1-2 tablespoons Artisan Bread Topping (or poppy seeds, celery seed, sesame seeds, etc)
In a large mixing bowl, mix together sourdough starter, water, 2 cups flour, oats, sunflower seeds, salt, and instant yeast. Add remaining flour and mix until combined. Knead for 5-6 minutes until smooth and elastic. Place in greased bowl and cover. Allow to rise until double 1-1.5 hours. Gently deflate and shape dough into a large round ball.
Grease a large cast iron Dutch oven and place the dough into it. Cover and allow the loaf to rise until puffy, 1-2 hours. Just before baking, brush the loaf with 1 tablespoon melted butter and sprinkle with Artisan Bread Topping. Cover with the lid and bake for 35 minutes at 450 degrees. Uncover and continue baking until the bread is a deep golden brown, about 7-10 minutes. Makes 1 large loaf.