Chocolate Chip Cookies

Preheat the oven to 350°F (175°C) and line a cookie sheet with parchment paper to prevent sticking and make cleanup easier.
In a large mixing bowl, cream the softened butter until fluffy, then gradually add brown and white sugars. Beat until light and creamy, then add the eggs one at a time along with the vanilla extract, mixing until fully combined.
In a separate bowl, whisk together the flour, baking soda, salt, and cornstarch. Gradually add this dry mixture to the butter mixture on low speed until just combined. Fold in the chocolate chips or chunks with a spatula.
Scoop the dough into balls of about 2 tablespoons each and place them 2 inches apart on the prepared cookie sheet.
Bake for 9–11 minutes until the edges are golden but the centers are still slightly soft. Let them cool on the sheet for 5 minutes before transferring to a wire rack to cool completely.