Set Sun Oven out to preheat. Spray a 9-inch round cake pan with cooking spray.
Combine the brown sugar, butter, and lemon juice in a large nonstick skillet and set over medium-low heat. Cook, stirring frequently, until the butter melts and the sugar is dissolved, about 3 minutes. Add the apples and water and continue cooking, gently stirring, until the apples begin to soften, about 5 minutes. Stir in cranberries and remove from heat.
When the apples are cool enough to handle, arrange the slices in concentric circles in the prepared pan. Top with the cranberries and sugar mixture. Set aside.
Whisk together the flour, sugar, baking powder, baking soda, and salt in a medium bowl. Whisk together the butter milk, oil, egg, and vanilla in a separate medium bowl. Stir the buttermilk mixture into the flour mixture until just blended.
Pour the batter evenly over the apples in the pan. Bake in the preheated Sun Oven until a toothpick inserted in the center comes out clean, 45 minutes to 1 hour. Let cool in the pan on a rack for 10 minutes. Run a thin knife around the cake to loosen. Invert onto a serving plate and lift off the pan. Brush the top of the cake with the melted jam.
This Sun Oven Apple Upside-Down Cake recipe is from the Sun Oven Cooking Cookbook. Download this Cookbook today.
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