Add dry ingredients (flours, baking powder, baking soda, sugar, salt) to a large mixing bowl, whisk together, set aside.
Add wet ingredients (starter, egg, milk, oil) to a small mixing bowl, whisk together until throughly mixed.
Next, add wet ingredients to dry ingredients in large bowl. Mix with a rubber spatula just until incorporated. Set aside.
Prepare mix ins, if desired.
Preheat skillet or frying pan to medium high heat. When water dropped on the surface dances around, it is ready.
Scoop ΒΌ cup of pancake batter onto the surface of the skillet/pan, spread batter into a 4" circle.
Sprinkle the top side of the pancake with any mix-ins, if desired.
Bake until bubbles appear on the top surface and the sides of the pancake appear dry.
Flip the pancake over and continue to cook for 1-2 more minutes until cooked through.
Remove to a plate and top with butter, syrup, jam, etc. Serve immediately.
Leftover pancakes can be refrigerated and reheated the following day. Store in refrigerator for up to 5 days or in the freezer for 3 months.