Creating Heavenly Summer Peach Bars is simple when you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and line an 8×8-inch baking pan with parchment paper for easy removal.

2. Mix Crust Ingredients: In a large bowl, combine the flour, granulated sugar, baking powder, and salt. Add the softened butter and mix until crumbly.

3. Add Egg: Stir in the egg until the mixture comes together to form a dough.

4. Press Dough: Reserve a small portion of the dough for the topping. Press the remaining dough evenly into the bottom of the prepared baking pan to form the crust.

5. Prepare Peaches: In a separate bowl, toss the sliced peaches with lemon juice and vanilla extract. If you’re using cinnamon, add it now for extra flavor.

6. Layer Peaches: Spread the peach mixture evenly over the crust in the baking pan.

7. Make Topping: In the reserved dough mixture, stir in rolled oats and brown sugar. Crumble this mixture over the top of the peaches.

8. Bake: Place in the preheated oven and bake for 30-35 minutes, or until the topping is golden brown.

9. Cool: Once baked, remove from the oven and let cool in the pan for about 20-30 minutes before lifting out using the parchment paper.

10. Slice: Cut into squares and serve warm or at room temperature.