Making Peaches and Cream Crumble Bars is a straightforward process. Here’s how to do it:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×9 inch baking pan or line it with parchment paper for easy removal.
2. Prepare the Crust: In a mixing bowl, combine the flour, ½ cup of sugar, butter, oats, baking powder, salt, and cinnamon. Mix until the mixture resembles coarse crumbs.
3. Press the Crust: Reserve 1 cup of the crumble mixture for the topping. Press the remaining mixture firmly into the bottom of the prepared baking pan to form the crust.
4. Bake the Crust: Bake the crust in the preheated oven for 10-12 minutes, or until lightly golden. Remove from the oven and let cool slightly.
5. Prepare the Filling: In another bowl, beat the cream cheese until smooth. Add the remaining ½ cup of sugar, egg, vanilla extract, and lemon juice. Mix until well combined.
6. Add Peaches: Gently fold in the diced peaches into the cream cheese mixture.
7. Spread the Filling: Pour the peach and cream cheese filling over the baked crust, spreading it evenly.
8. Add Topping: Sprinkle the reserved crumble mixture evenly over the peach layer.
9. Bake Again: Return the pan 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: Remove from the oven and allow to cool in the pan for at least 30 minutes before slicing into bars.

These simple steps will guide you in creating these incredible Peaches and Cream Crumble Bars with ease.