Preheat oven to 350 F. Lightly coat a 9-inch deep-dish pie pan or square baking dish with non-stick spray or use a silicone baking dish. Arrange the plums in the pan. (Note: If your plums are not very sweet, you can sprinkle them with a little sugar or agave nectar.)
Combine the yogurt/tofu, water, lemon juice, agave nectar, and vanilla extract in a small mixing bowl. Add the stevia, whisking well to make sure that it dissolves completely. (If you see clumps of stevia, put the mixture into the blender and process until smooth.)
In a medium-sized bowl, combine the remaining, dry ingredients. Add the wet to the dry, and stir until well combined. Pour the batter over the fruit, and tap the pan lightly on the counter to remove trapped air bubbles. Bake for 40-50 minutes or until a toothpick inserted in the center comes out clean. Let cool for at least 15 minutes before serving.
*I used NuNaturals Pure White Stevia Extract, which is extremely concentrated. If you use another sweetener, you may need to add more.*If you can’t use soy products, try substituting applesauce for the yogurt.