1-Preheat oven to 375 degrees and line: Preheat oven to 375 degrees and line a large baking sheet with parchment paper.
2-In a large mixing bowl beat softened: In a large mixing bowl beat softened butter, brown sugar, and granulated sugar until soft and fluffy.
3-Beat in eggs and vanilla until combined: Beat in eggs and vanilla until combined.
4-Add cornstarch, baking soda, and salt and: Add cornstarch, baking soda, and salt and mix well.
5-Beat in flour 1 cup at a: Beat in flour 1 cup at a time and mix until just combined. Be sure not to overmix.
6-Stir in chocolate chips with a spoon: Stir in chocolate chips with a spoon until well distributed.
7-For large Crumbl cookies scoop out 1/3: For large Crumbl cookies scoop out 1/3 cup of cookie dough on prepared baking sheet. Bake in preheated oven for 10-11 minutes or until just golden brown on the edges and slightly firm in the middle. Do not over bake.
8-For regular size cookies use a medium: For regular size cookies use a medium ice cream scoop and place dough on prepared baking sheet. Bake in preheated oven for 8 minutes or until just golden brown on the edges and slightly firm in the middle. Do not over bake.
9-Remove from baking sheet and allow to: Remove from baking sheet and allow to cool before serving. Enjoy!