Preheat oven to 350°F.
Cream the wet ingredients: In a large bowl, mix the sugars, softened butter, eggs, and vanilla until smooth and fluffy.
Add the dry ingredients: Stir in the flour and baking soda until *just* combined; it’s okay if there’s a bit of flour. Don’t overmix, we’re making cookies, not bread.
Chocolate time: Fold in the chopped chocolate to finish mixing any remaining loose flour and evenly distribute.
Chill the dough: Pop the dough in the freezer for at least 15 minutes (but a max of 30). This helps them hold their shape while baking and keeps the centers nice and gooey.
Bake: Scoop and space your dough on a lined baking sheet. For regular cookies: bake 12 minutes. For big bakery style cookies (like mine): bake 15–17 minutes.
Cool slightly… then devour: Let them sit for 2–3 minutes out of the oven (if you can wait). Then grab one while the chocolate is still molten.