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Preheat oven to 350°F.
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Grease a 9 x 13 pan and an 8 x 8 pan. Or, you can line them with foil and spray the foil with cooking spray.
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In a saucepan over low heat, melt the butter and chocolate until smooth. Set aside to cool slightly.
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Whisk in sugar gradually. Add eggs, one at a time, stirring after each addition. Stir in vanilla just until blended.
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Slowly add in the flour and the salt. Mix until fully incorporated.
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Stir in the chocolate chips.
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Spread batter evenly in the pans.
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Bake for 30 minutes, or until toothpick inserted in center comes out clean.
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Place pans on rack to cool. Then, cut into squares.
