Creating heavenly bars is easier than ever. Just follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Pan: Grease a 9×9 inch baking dish or line it with parchment paper for easy removal.
3. Mix Peaches: In a bowl, combine the diced peaches, sugar, lemon juice, cornstarch, and vanilla extract. Stir gently and set aside.
4. Combine Dry Ingredients: In a separate bowl, whisk together the flour, oats, baking powder, baking soda, and salt.
5. Mix Wet Ingredients: In another bowl, mix the melted butter and egg until well combined.
6. Combine All Ingredients: Gradually add the wet mixture to the dry ingredients and mix until a soft dough forms.
7. Press the Crust: Spread half of the dough into the bottom of the prepared baking dish, pressing down firmly to create a base.
8. Add the Filling: Pour the peach mixture over the crust, spreading evenly.
9. Top with Dough: Crumble the remaining dough over the peach filling.
10. Bake: Place in the preheated oven and bake for 35-40 minutes or until the top is golden and the filling is bubbly.
11. Cool Completely: Allow the bars to cool in the pan for at least 30 minutes before slicing.

Following these steps will yield a batch of Heavenly Summer Peach Bars that are perfect for enjoying any time during the warm months.