Begin by preheating your oven to 350°F (175°C).
In a large mixing bowl, use an electric mixer to cream together the softened salted butter and brown sugar until light and fluffy.
Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract until fully combined.
In a separate bowl, whisk together the all-purpose flour, baking soda, and kosher salt.
Gradually add the dry ingredient mixture to the wet ingredients, mixing until just combined.
Gently fold in the chocolate chunks or chips, coconut flakes, and roasted peanuts.
Fold in the sweetened condensed milk, ensuring even distribution throughout the dough.
Using a cookie scoop or tablespoon, drop rounded balls of dough onto a lined baking sheet, spacing them about 2 inches apart. Bake for 10-12 minutes, or until edges are lightly golden.
Remove from the oven and let cool on the baking sheet for 5 minutes before transferring to a cooling rack.