Follow these simple steps for a foolproof way to make amazing Chewy Brown Butter Chocolate Chip Cookies:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.
2. Brown the Butter: In a medium saucepan over medium heat, melt the butter, stirring frequently until it turns golden brown and has a nutty aroma. Remove from heat and let it cool slightly.
3. Mix Sugars: In a large mixing bowl, combine the brown sugar and granulated sugar. Pour in the brown butter and mix well.
4. Add Eggs and Vanilla: Add the egg, egg yolk, and vanilla extract to the sugar mixture, stirring until fully combined.
5. Combine Dry Ingredients: In another bowl, whisk together the flour, baking soda, and salt.
6. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to over-mix.
7. Fold in Chocolate Chips: Gently fold in the chocolate chips and nuts (if using) until evenly distributed.
8. Scoop the Dough: Using a tablespoon or cookie scoop, drop rounded balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.
9. Bake: Place the cookies in the preheated oven and bake for 10-12 minutes, or until the edges are lightly golden while the centers remain slightly soft.
10. Cool: Remove the cookies from the oven and let them cool on the baking sheets for about 5 minutes. Then transfer them to a wire rack to cool completely.

By following these straightforward steps, you’ll create a batch of Chewy Brown Butter Chocolate Chip Cookies that are guaranteed to impress.