1-Step 1: Prepare Your Workspace Preheat oven to 400°F and line a baking sheet with parchment paper. This high temperature is key to the recipe’s success. The intense heat quickly sets the outside of the cookies, preventing excessive spreading while keeping the inside soft and gooey. If you prefer to try another delicious cookie variation, check out our pudding cookie recipe as well.

2-Step 2: Cream the Butter and Sugars In a mixer bowl, combine your cold cubed butter with dark brown sugar, light brown sugar, and granulated sugar. Mix on low speed for 30 seconds to incorporate, then increase to medium speed and beat for 4 minutes until the mixture is light and fluffy. This extended mixing time is crucial because it creates air pockets in the cold butter, which helps the cookies puff up during baking. You’re not trying to dissolve the sugar completely; rather, you’re creating a network of butter and sugar that will produce a tender, thick cookie. The mixture should look pale and fluffy, with the butter still visible in small pieces throughout.

3-Step 3: Add Wet Ingredients and Leavening Add eggs, vanilla, salt, baking soda, and cornstarch to your butter mixture. Mix for 1 minute until smooth, scraping the bowl sides as needed to ensure even distribution. The eggs should be fully incorporated, creating a cohesive mixture that looks glossy and uniform. This is where the cornstarch works its magic, dispersing throughout the dough to create a tenderizer effect. The baking soda begins reacting with the slight acidity in the brown sugar, creating tiny bubbles that will help your cookies rise.

4-Step 4: Incorporate the Flour On low speed, gradually add the flour and mix until just combined. This is perhaps the most critical step in achieving soft chocolate chip walnut cookies. Overmixing develops gluten, which creates tough, bread-like cookies. Stop mixing as soon as no dry flour streaks remain visible. The dough will be thick and slightly sticky, which is exactly what you want. Think of it as a shaggy dough rather than a smooth, completely uniform mixture.

5-Step 5: Fold in Chocolate Chips and Walnuts With the mixer on low speed (or by hand with a sturdy spoon), incorporate the chocolate chips and chopped walnuts. Mix only until they’re evenly distributed throughout the dough. The chocolate chips should be well dispersed, and the walnuts should be visible throughout. Remember that the dough is thick, so take your time to ensure even distribution without overworking the dough.

6-Step 6: Portion the Dough Use a large 3-tablespoon cookie scoop to portion dough onto your prepared baking sheet, placing balls about 2 inches apart. This large scoop size creates generous, bakery-style cookies that are impressive to serve and satisfying to eat. If you don’t have a cookie scoop, use a measuring cup or roll portions by hand. For consistent results, try to make each ball roughly the same size.

7-Step 7: Bake to Golden Perfection Bake for 8-9 minutes until edges and tops are lightly golden. The cookies will look slightly underdone in the centers, which is exactly what you want. They’ll continue cooking on the hot baking sheet after you remove them from the oven. Look for the edges to be set and just starting to turn golden brown. The tops should have a slight sheen but look mostly set. Every oven bakes differently, so start checking at the 7-minute mark on your first batch.

8-Step 8: Cool Properly Cool cookies on the baking sheet for 2-3 minutes, then transfer to a wire rack to cool completely. This two-stage cooling process lets the cookies set up enough to move without breaking, while the wire rack prevents the bottoms from becoming soggy. The cookies will deflate slightly as they cool, developing those beautiful cracks and crevices on top that signal a perfectly baked cookie.