In a large bowl, cream the butter, brown sugar, and sugar until the mixture is fluffy and well-blended.

Add the eggs and vanilla extract, and beat again until fully incorporated.

Mix in the flour, baking soda, and salt until a smooth dough forms.

Gently fold in the dark chocolate chips and chunks.

Cover the dough and refrigerate for at least 30 minutes.

When ready to bake, preheat the oven to 350°F and line a baking sheet with parchment paper.

Scoop tablespoon-sized portions of dough and place them evenly on the prepared sheet.

Bake for 10 to 12 minutes, or until edges are golden but centers remain soft.

Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.