Making Peaches and Cream Crumble Bars is a joyful process. Follow these simple steps to bring this delightful recipe to life:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C). Grease a 9×9-inch baking dish with butter or cooking spray.
2. Prepare Crust Mixture: In a large bowl, combine flour, oats, brown sugar, granulated sugar, baking powder, baking soda, cinnamon, and salt. Stir until well mixed.
3. Add Butter: Add the cold, cubed butter to the dry mixture. Use a pastry cutter or your hands to mix until crumbly.
4. Set Aside: Reserve about 1 cup of this mixture for the topping. Press the remaining mixture into the bottom of your prepared baking dish to form a crust. Bake for 15 minutes.
5. Prepare Peach Filling: While the crust is baking, combine diced peaches with a tablespoon of granulated sugar and set aside.
6. Make Cream Cheese Filling: In another bowl, beat the softened cream cheese with powdered sugar and vanilla extract until smooth and creamy. Add the egg and mix until fully incorporated.
7. Assemble Bars: After the crust is done baking, remove it from the oven. Spread the cream cheese mixture evenly over the crust. Top with the diced peaches.
8. Add Topping: Sprinkle the reserved crumble mixture evenly over the peach layer.
9. Bake Again: Return the dish to the oven and bake for an additional 30-35 minutes, or until the topping is golden brown and the filling is set.
10. Cool: Once baked, remove from the oven and allow to cool in the pan for at least 30 minutes.
11. Slice and Serve: Cut into squares and enjoy each wonderful bite.