Making Peach Crumb Bars is straightforward if you follow these clear steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Prepare Peaches: In a mixing bowl, combine sliced peaches with ½ cup of sugar and lemon juice. Set aside to marinate for about 10 minutes.
3. Make Crust and Topping: In another bowl, mix the flour, oats, remaining sugar, baking powder, cinnamon, and salt. Add softened butter and vanilla extract to the mixture. Use a fork or pastry cutter to combine until crumbly.
4. Press Mixture: Take about two-thirds of the crumb mixture and press it firmly into the bottom of the greased baking dish to form the crust.
5. Add Peach Filling: Spread the marinated peaches evenly over the crust.
6. Top with Crumbs: Sprinkle the remaining crumb mixture over the peaches to create a topping.
7. Bake: Place the dish in the preheated oven and bake for 40-45 minutes or until the top is golden brown.
8. Cool: Remove from the oven and let it cool in the pan for 30 minutes. This cooling period helps the bars set.
9. Slice and Serve: Cut into squares and enjoy!

Following these instructions will guide you through creating these amazing Peach Crumb Bars effortlessly.