Start by preheating your oven to 350°F. While it heats, ensure your eggs and butter are at room temperature (about 70°F)—this helps them emulsify properly with the yogurt and sugar, creating a creamy, well-incorporated dough. Room temperature ingredients mix more smoothly and create better texture in the final cookies.

In a medium bowl, whisk together the flour, baking soda, cornstarch, and salt. Whisking aerates the flour and distributes the leavening agents evenly throughout, which ensures consistent rise and texture across all your cookies. Set this mixture aside—you'll combine it with the wet ingredients shortly.

In a large bowl, beat together the melted and cooled butter, sugar, brown sugar, greek yogurt, and vanilla extract until the mixture is light, fluffy, and creamy—this should take about 2-3 minutes with an electric mixer. The greek yogurt adds moisture and tang while creating a tender crumb, and beating this mixture thoroughly incorporates air for a lighter texture. I love using Fage yogurt because its thick consistency blends seamlessly without making the dough wet.

Add the room temperature eggs one at a time to the butter mixture, beating well after each addition to fully incorporate. This gradual approach prevents the dough from looking curdled and ensures the eggs emulsify properly with the fats and yogurt, creating a smooth, cohesive dough.

Gently fold the dry ingredient mixture from Step 2 into the wet mixture from Step 4 using a spatula or wooden spoon—mix just until no flour streaks remain. Overmixing develops gluten and makes cookies tough, so stop as soon as everything is combined. Fold in the chocolate chips until evenly distributed throughout the dough.

Drop rounded tablespoons of dough onto ungreased baking sheets, spacing them about 2 inches apart to allow for spreading. I find that slightly flattening each scoop by hand helps them bake more evenly. Bake in your preheated 350°F oven for 10 to 12 minutes, until the edges are set but the centers still look slightly underdone—they'll continue cooking as they cool, resulting in cookies that are crispy on the outside and chewy in the middle.

Remove cookies from the oven and let them rest on the baking sheet for 2 minutes—this allows them to set slightly without hardening completely. Transfer them to a wire cooling rack to cool completely. This two-stage cooling is key: the brief rest on the hot sheet helps them develop crispy edges, while the rack prevents steam from making the bottoms soggy.