In a bowl mix;1 cup warm water, ½ cup sourdough starter, 1 ½ cups all-purpose flour, ½ teaspoon dry instant yeastStir together and let rest in a warm spot for two hours.Add;1 cup all-purpose flour, ½ cup whole wheat pastry flour, 1 cup shredded sharp cheddar cheese, ½ teaspoon kosher salt Stir together to make a shaggy dough, then turn on to a well-floured board or counter. Dust your hands with flour and mix the dough.
Then knead for 5 minutes until smooth and shape into a ball.
Oil your bowl, place the dough in and then turn over so the top has a nice light oil coat.Let rise for 90 minutes, nearly doubled in size.
Remove the dough from the bowl and shape into a loaf. Place in a lightly oiled loaf pan, let rise for one hour until doubled in size. Preheat oven to 350. Cut a deep slice down the center of the loaf.Brush the top very lightly with water and sprinkle about a tablespoon of shredded cheese over the top.
Bake for 25 minutes, until the loaf sounds hollow when tapped on the bottom, or the internal temperature is over 190 degrees. Remove from pan and let cool for ten minutes. Slice and serve!