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Ingredients
All-purpose flour, 1 1/4 cups
Salt
Unsalted butter, 12 tablespoons (6 oz)
Dark chocolate, 15 oz (bittersweet or semi-sweet chocolate, good quality).
3 large eggs
Granulated sugar, 1 1/2 cups
OPTIONAL: up to 1/2 cup mix-ins like chocolate chips, white chocolate chunks, nuts, m&ms, etc.
Equipment
9x13 baking pan
Aluminum foil
Baking spray
Medium, microwave-safe bowl
Two mixing bowls, one large
Electric mixer, handheld or stand (this can be made with a whisk and a strong arm if necessary)
Whisk
Rubber spatula