Step 1: In a large mixing bowl, combine the active potato flake sourdough starter, warm water, oil, sugar, and salt. Stir until the sugar is dissolved.
Step 2: Gradually add the bread flour one cup at a time, mixing well after each addition. Continue adding flour until a soft dough forms that pulls away from the sides of the bowl.
Step 3: Turn the dough out onto a lightly floured surface and knead for about 5-8 minutes until smooth and elastic. The dough should be slightly tacky but not sticky.
Step 4: Place the dough in a large greased bowl, turning once to grease the top. Cover with a clean cloth and let rise in a warm place for 8-12 hours or until doubled in size.
Step 5: Punch down the dough and divide it into two equal portions. Shape into loaves and place into greased 9x5 inch loaf pans. These are the core steps for most recipes using potato flake sourdough starter.
Step 6: Cover and let rise again in a warm place for 4-6 hours until the dough has risen about 1 inch above the tops of the pans. Bake at 350°F for 25-30 minutes until golden brown.