Follow these steps to bring this delightful treat to life:

1. Preheat your oven to 350°F (175°C) and line a 9×13 inch baking dish with parchment paper.
2. In a medium saucepan, melt the butter over medium heat. Continue to cook until it turns a golden brown and releases a nutty aroma, about 5 minutes. Be sure to stir frequently and watch closely to prevent burning.
3. Pour the brown butter into a large mixing bowl and let it cool for a few minutes.
4. Add the granulated sugar and brown sugar to the butter, whisking until combined.
5. Beat in the eggs one at a time, followed by the vanilla extract.
6. In a separate bowl, sift together the flour, cocoa powder, baking soda, and salt.
7. Gradually mix the dry ingredients into the wet mixture until just combined, then fold in the chocolate chips and walnuts.
8. Spread the batter evenly in the prepared baking dish.
9. Bake for 25-30 minutes, or until the edges are set and the center is slightly soft. A toothpick inserted should come out with a few moist crumbs.
10. Allow the brookies to cool in the pan before cutting into squares.

These steps echo the times spent in my grandmother’s kitchen, where patience and love were key ingredients in every dish.