Melt together the chocolate and butter. Stir until smooth and then cool. Whisk in the sugar by hand, followed by the eggs, one at a time. Stir in the vanilla and then the flour. You can add toasted nuts as well, if you'd like.
Pour into a greased and lined pan (8" 8" for thicker brownies and 9" X 13" for thinner brownies) and bake at 325 until done.
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