Preheat the oven to 350ºF/180ºC and grease 13x9 inch baking pan
Melt the butter and chocolate in a large saucepan gently over low heat without letting the mixture bubble or sizzle. Stir well to combine and remove from heat and allow to cool.
Whisk in the sugar and brown sugar into the pot with the chocolate mixture and mix well until there is no sign of melted butter left.
Whisk in the beaten eggs, vanilla, and salt. Mix well until completely incorporated.
Stir in the cocoa powder.
With a wooden spoon, stir in the sifted flour and chocolate chips until incorporated. It's important not to overmix the batter at this point.
Spread into the pan. place the pan in the oven and set your timer for 30 minutes.
When the timer goes off, open the oven, pull the shelf out, and gently shake the pan. If the brownies wobble in the middle, bake in five-minute increments until solid in the middle and the sides are just beginning to come away from the pan.For a less fudgy brownie, bake until the top is no longer shiny and the sides pull away from the pan.
Remove from the oven and cool the brownies for at least an hour before removing from the pan and slicing.
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Notes
This recipe makes a big pan of 24 generously sized brownies. To make 12 brownies cut the recipe in half and use an 8-inch square pan.TIPS:
Melt the butter and chocolate over LOW heat. Overheating chocolate can cause it to seize up, which will ruin your brownies.
Allow the butter and chocolate to cool until the pot is cool enough to touch before moving on to the next step.
Use room-temperature eggs. Eggs combine easier when mixing at room temperature and mix more evenly into the batter. Your brownies will have a lighter texture and cook more evenly.
To quickly warm your eggs: Just set them in a bowl of warm water for 10 - 15 minutes. This will allow them to warm all the way through.
Don’t overmix. When mixing in the flour, only mix until combined. A few lumps are fine. Over-mixing creates a cake-like brownie.