Preheat oven to 350 degrees F (180 degrees C). Grease an 8×8 pan. Take the Unsalted Butter (4 tablespoon) out of the fridge, so it can soften.
Combine the Old Fashioned Rolled Oats (1 cup) and Water (2/3 cup). The oats will absorb the water and soften. This will result in a moist cake full of flavor.
Combine the All-Purpose Flour (1/2 cup), Whole Wheat Flour (1/4 cup), Baking Soda (1/2 teaspoon), Baking Powder (1/2 teaspoon), Salt (3/4 teaspoon) and Ground Cinnamon (1/2 teaspoon) in a bowl.
Cream the Brown Sugar (1/4 cup) and unsalted butter using an electric mixer. Add the Egg (1) and Vanilla Extract (1 teaspoon).
Slice and dice the Peach (1 cup) and Plum (1 cup) and combine. Put a 1/2 cup of the chopped fruit aside. This will grace the top later.
Combine flour mixture, oat mixture and butter mixture. Fold in the fruit and chopped Almonds (1/4 cup) , keeping a handful of almonds out to sprinkle on top.
Pour batter into the prepared pan. Sprinkle with remaining fruit, Old Fashioned Rolled Oats (3 tablespoon) and the handful of almonds.
Bake for 40-50 minutes until golden brown.
Let cool on a wire rack. Serve and enjoy!