I got this recipe from my mother-in-law. You have to plan a day ahead to get the starter made.
Yeasted Buttermilk Bread
Starter - day 1
2 cups wheat flour
1/2 to 3/4 cup buttermilk (I use plain homemade milk kefir. Yogurt would probably work too.)
1/4 cup melted butter
Mix starter ingredients together in a bowl, cover, and leave in a warm place for 12-24hrs.
Day 2
1/8 cup warm water
1 1/8 teaspoon yeast
1Tablespoon honey
1/2 teaspoon salt
1/4 teaspoon baking soda
1/2 cup unbleached white flour
Mix warm water, yeast, honey, salt, and baking soda together. Then mix into the starter dough from day 1. Mix 1/4 cup of the white flour into the dough and use the rest to knead the dough.
Form a loaf and put into a buttered bread pan. Let rise until double. Bake at 350 degrees Fahrenheit for 30 minutes.
I like to butter the top of the bread and let it cool a few minutes before putting it in a plastic bag to keep it extra moist, but that's not necessary.