Preheat oven to 175°C and line a baking sheet with parchment paper.
In a large bowl, cream together butter, granulated sugar, and brown sugar until light and fluffy (about 2-3 minutes).
Add eggs and vanilla extract, mixing until well combined.
In another bowl, whisk together flour, cornstarch, baking powder, baking soda, and salt.
Gradually add dry ingredients to the wet ingredients, mixing until just combined.
Fold in chocolate chips, ensuring even distribution.
Scoop large dough balls (about ¼ cup each) and place them on the baking sheet, spacing them apart.
Bake for 10-12 minutes until the edges are golden but the center is still soft.
Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
Enjoy your bakery-style Crumbl cookies!