1-First Step: Prep the oven and baking sheet Start by preheating your oven to 400 degrees Fahrenheit. Line a baking sheet with parchment paper so the cookies lift off cleanly after baking. This higher heat helps the Chocolate Chip Walnut Cookies stay thick and soft inside while developing lightly golden edges. Before you begin mixing, measure everything out. Cookie dough moves fast once the mixer starts, and having your ingredients ready makes the process smooth and stress-free. If you are baking with kids or helping a beginner baker, this is a great moment to organize the counter and let everyone see what goes into the dough.

2-Second Step: Cream the butter and sugars In a stand mixer, add the cold cubed butter, dark brown sugar, light brown sugar, and granulated sugar. Mix on low speed for 30 seconds, then move to medium speed and beat for 4 minutes until the mixture looks fluffy and well combined. This step gives the cookies their rich, sweet base and helps create a soft texture. Because the butter is cold, it takes a little extra mixing time, but that is part of the magic. The dough gets enough air for a nice lift without turning greasy or flat. If you only have room temperature butter, it can still work, but the cookies may spread a bit more, so watch the baking time closely.

3-Third Step: Add the eggs and flavorings Add the eggs, vanilla, kosher salt, baking soda, and cornstarch. Mix for 1 minute until the dough is smooth, scraping down the sides as needed. This is where the cookie dough starts to smell amazing, and the cornstarch helps give the cookies a soft, thick finish. The salt balances the sweetness, while the vanilla rounds out the flavor. If you like a stronger vanilla note, you can add a tiny splash more, but the listed amount is already balanced for a classic chocolate chip walnut cookie flavor.

4-Fourth Step: Mix in the flour Turn the mixer to low and add the all purpose flour. Mix only until just combined. Do not overmix here, because that can make the cookies tougher. The dough should look thick and slightly sticky, which is exactly what you want for bakery-style results. If the dough seems a little too soft, a small bit more flour can help. That is one of the best tricks for keeping these cookies thick and sturdy, especially if your kitchen runs warm. Busy bakers will like this part because it comes together quickly and does not need chilling before baking.

5-Fifth Step: Fold in the chocolate chips and walnuts Add the chocolate chips and chopped walnuts, then mix until they are evenly spread through the dough. The chocolate chips bring melty pockets of sweetness, and the walnuts add crunch and a deeper, nutty flavor. This is where the dough turns into the classic cookie everyone wants to grab straight from the bowl. If you want a different twist, you can use pecans, pistachios, peanuts, or macadamia nuts instead. You can also reduce the walnuts to 1 cup if you prefer a lighter nut presence. For a nut-free version, simply skip them and add more chocolate chips.

6-Sixth Step: Portion the dough Use a 3 tablespoon cookie scoop to portion the dough onto the lined baking sheet. Place each dough ball 2 inches apart so the cookies have room to spread. This size gives you a generous cookie with a soft middle and crisp edge. If you want to freeze dough for later, this is the best stage to do it. Scoop the dough onto a sheet, flash freeze for 45 minutes, then move the dough balls to a bag for up to 30 days. When baking from frozen, reduce the oven temperature to 375 degrees Fahrenheit and add 1 to 2 extra minutes if needed.

7-Seventh Step: Bake and cool Bake for 8 to 9 minutes, just until the edges and tops are lightly golden. The centers should still look a little soft when you pull them out, because they will finish setting as they cool. This short bake time is what helps these Chocolate Chip Walnut Cookies stay chewy instead of dry. Let the cookies cool on the baking sheet for 2 to 3 minutes, then move them to a wire rack to cool completely. If you like warm cookies, this is the moment to enjoy one, but letting them set fully gives the best texture for storing later. For soft cookies, pull them from the oven when they still look slightly underdone in the center. They will keep cooking on the hot pan.