1-Prepping Your Oven and Ingredients: First, preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper for easy cleanup and perfect results. In a large bowl, cream together the unsalted butter with the brown and granulated sugars until it’s light and fluffy this step is key for that chewy texture. Next, add the egg, egg yolk, and vanilla extract, beating them in until everything is well mixed.

2-Prepping Your Oven and Ingredients: In another bowl, whisk the flour, baking soda, cornstarch, and salt together to ensure even distribution. Gradually mix the dry ingredients into the wet ones, stirring gently to keep the dough tender overmixing can make your cookies tough, so go easy here. Once combined, fold in the chocolate chips for that irresistible burst of flavor in every bite.

3-Baking and Cooling: Scoop the dough onto your prepared sheet, spacing each ball about 2 inches apart to allow for spreading. Pop them in the oven for 10-12 minutes, watching for golden edges while keeping the centers soft for that gooey center we love. After baking, let them cool on the sheet for 5 minutes before moving to a rack you’d be surprised how this little wait improves the texture.