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Cut each fruit bar in half lengthwise, cut each stick into 8 pieces and then coarse chop and set aside.
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Combine all the dry ingredients in a 9x9 square baking dish or pan with a fork or a whisk. Smooth the surface and make 4 wells (2 large, 2 small) and add the applesauce, olive oil, apple cider vinegar, and vanilla extract into separate wells.
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Add water and stir until the dry ingredients are mostly mixed in.
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Add the chopped That’s It pieces (reserve 1-2 tablespoons for sprinkling on top if desired) and stir until the batter is evenly mixed. Use a spatula to scrape the sides and smooth the top, add the sprinkles if using.
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Bake for 35 minutes or until golden brown and a toothpick in the center comes out clean (for my oven, it takes about 37 minutes).
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Allow the cake to cool and it’s ready to serve when the pan is cool enough to touch. Use a serrated knife to cut the cake in an up and down motion so that you don’t drag the fruit bar pieces and tear the cake.