Preheat the oven to 350F (180C). Peel and cut the apples in small cubes.
Add the apples to a skillet with the brown sugar, lemon juice, and cinnamon. Cook for about 5 minutes over medium heat while you prepare the dough.
In a food processor, add the flour, regular sugar, baking powder and salt. Mix to combine.
Add the butter (cold from the fridge and cut in cubes), and the egg. Pulse until the dough starts to come together in a crumbly dough.
Line a 10 or 11 inches round tart pan with parchment paper or grease with butter. Add a little over half of the dough on the bottom and press down gently with a spoon or the bottom of a measuring cup.
Top with the cooked apples, leaving free a ½ inch edge. Top with the remaining dough, pinching it in pieces between two fingers.
Bake at 350F for about 45 minutes, until lightly golden on top and a the edges. Sprinkle with powdered sugar and enjoy!
