Preheat and Prep: Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.

Mix Wet Ingredients: In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until the mixture is light and fluffy. Add in the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.

Combine Dry Ingredients: In another bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Add Chocolate Chunks: Fold in the milk and white chocolate chunks until evenly distributed throughout the dough.

Shape the Cookies: Using a large cookie scoop, drop dough onto the prepared baking sheets. Shape slightly with hands if needed to form a round shape.

Bake: Bake for 10-12 minutes or until the edges are golden brown but the centers are still soft. The cookies will continue to bake on the sheet while cooling.

Top with Chocolate Bars: While the cookies are still warm, gently press pieces of milk and white chocolate bars onto the top. Let them melt slightly.

Drizzle (Optional): For an extra touch, drizzle with warmed Nutella or chocolate spread over the top.