1-First Step: Preheat and Prep. Heat your oven to 375°F (190°C). Line two baking sheets with parchment paper. This prevents sticking and ensures even baking. Chop walnuts if not pre-chopped. Measure all ingredients for smooth workflow. Mise en place saves time and reduces errors.

2-Second Step: Cream Butter and Sugars. In a large bowl, beat softened butter, brown sugar, and white sugar with a mixer on medium speed for 2-3 minutes. Mixture turns light and fluffy. Scrape bowl sides often. This step builds structure for tall cookies. Cold butter leads to dense results, so let it soften at room temp.

3-Third Step: Add Eggs and Vanilla. Beat in eggs one at a time, mixing well after each. Add vanilla extract. Batter may look curdled, but it smooths out. Eggs provide lift and moisture. Use large eggs for consistent size. Fresh vanilla boosts flavor over imitation.

4-Fourth Step: Mix Dry Ingredients. In a separate bowl, whisk flour, baking soda, and salt. Gradually add to wet mixture on low speed. Stop when just combined to avoid tough cookies. Overmixing develops gluten. Dough looks shaggy but firms up.

5-Fifth Step: Fold in Chips and Nuts. Gently stir in chocolate chips and chopped walnuts by hand. Use a spatula for even distribution. Taste dough for balance. Walnuts add texture; chips melt perfectly. Pro tip: Toast nuts first at 350°F for 5 minutes for deeper flavor.

6-Sixth Step: Chill Dough. Cover bowl and refrigerate 30 minutes. Chilling prevents spread for thicker soft chewy chocolate chip walnut cookies. Skip for thinner crisps. Portion into tablespoon-sized balls while waiting.

7-Seventh Step: Scoop and Bake. Place dough balls 2 inches apart on sheets. Bake 9-11 minutes until edges golden, centers soft. Rotate sheets halfway. Oven times vary; watch closely. Overbaking dries them out.

8-Final Step: Cool and Store. Cool on sheets 5 minutes, then move to wire racks. Cookies firm as they cool. Enjoy warm or store. Yields 36 perfect treats. Pair with chocolate chip cookie dough ice cream for extra fun.