Preheat your oven to 350 degrees. Spray a 9x13" baking dish with cooking spray.
In a large bowl, whisk together the melted butter, white sugar, vanilla, eggs, and salt.
Sift in the flour and cocoa powder. (Or whisk them together in another bowl.) Stir with a rubber spatula until barely combined, then fold in about 1 1/2 cups of the white chips.
Spread the batter in the prepared pan and sprinkle the remaining chips on top.
Bake at 350° for about 35 minutes, or until a toothpick inserted in the middle comes out with moist crumbs. For fudgy brownies, don't overbake!
Place the pan on a wire rack to speed up the cooling process. Brownies are easier to cut after they are completely cool, but we never wait that long!
Notes
Room temp eggs make it easier to whisk the batter. You can place them in a bowl of hot water for 5-8 minutes if you forget to take them out of the fridge.
For extra easy clean up, you can line your pan with aluminum foil or parchment paper before spraying with cooking spray.
If you use unsalted butter, add another 1/4 - 1/2 teaspoon of salt to the brownie batter.