Preheat oven to 375 degrees and grease a 9x13 inch pan.
For the crust:
Whisk together the flour, sugar, baking powder, salt, and cinnamon. Cut in the butter with a fork until mixture is crumbly. Mix in the egg and vanilla. *Note: If you're using a food processor you can just add everything to the food processor and pulse until crumbly. Then add in the egg and vanilla and process until combined.
Reserve 2 cups of the crust mixture and press the remaining mixture into the prepared pan.
For the peaches:
Toss peaches with lemon juice and almond extract. Whisk together the sugar, cornstarch, and cinnamon. Toss to coat.
Pour peaches over the bottom crust. Sprinkle reserved dough on top of peaches.
Bake for 35-45 minutes or until topping is lightly browned. Cool completely and cut into bars.
Notes
CAN I MAKE THESE AHEAD?I wouldn't suggest making these too far ahead of time because the filling will soften the crust. The day of or the day before is fine.