Preheat your oven to 350°F (175°C) to ensure even baking.
In a large mixing bowl, cream together the room temperature butter, sugar, and brown sugar using an electric mixer until light and fluffy, about 2-3 minutes.
Beat in the eggs one at a time, fully incorporating each before adding the next. Mix in the vanilla extract until well combined.
In a separate bowl, whisk together the flour, salt, and baking soda. Gradually add this dry mixture to the wet ingredients, mixing until just combined without overmixing.
Gently fold in the chopped Heath bars and walnuts with a spatula to distribute evenly throughout the dough.
Drop rounded balls of dough onto a parchment-lined baking sheet using a cookie scoop or tablespoon, spacing them apart to allow spreading. Bake for 10-12 minutes or until edges are lightly golden.
Remove cookies from oven and let cool on the baking sheet for about 5 minutes, then transfer to a cooling rack. Enjoy warm or at room temperature!