Buttermilk Substitute: Measure 1 TB of lemon juice or white vinegar into a measuring cup. Fill the cup with milk to measure 1 cup. Let stand for 5 minutes. Use in recipe.
Gluten Free: Substitute gluten free flour for the regular flour. I used Tom Sawyer Gluten Free Flour. The batter was much lighter, more like a cupcake batter, but the results looked and tasted the same.
Cooking Time: The time it takes to cook in a solar oven varies depending on the type of oven, the weather, and how hot the cooker gets. My bread baked for 45 minutes at 330 F (166C) and it was done, but I left it in the solar oven for another 15 minutes to let it brown a little bit on top.
Bake in a regular oven at 350 degrees F(177 C) for 45 to 50 minutes.