Preheat oven to 350 Fahrenheit.

In a large mixing bowl, cream softened butter with both sugars until fluffy.

Blend in the eggs one at a time.

Add flour, baking soda, salt and 10 ounces of the chocolate; combine.

Spoon cookie dough 2 inches apart on to a parchment-lined baking sheet using heaping tablespoons.

Bake for 10 minutes. Top the partially baked cookies with a few pieces of the reserved chocolate. Bake for an additional 5 minutes, or until the cookies are brown around the edges and soft in the centers. Do not overbake.

Allow the cookies to cool slightly on the pan until they can be removed with out tearing.

Repeat process with remaining cookie dough. Sprinkle cookies with sea salt while still warm, if desired.