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Preheat oven to 350 degrees and place the rack in the center of the oven.
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Spray an 8" square pan with baking spray and line the bottom of the pan with parchment or wax paper.
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Melt the chocolate and butter in a bowl for 2 minutes in microwave. Take out after 1 minute and stir.
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Remove and stir in the cocoa powder and sugar .
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Place chocolate mix in mixer bowl and whisk in the vanilla extract and eggs, one at a time, beating well after each addition.
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Finally, stir in the flour, salt and chocolate chips and orange zest.
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Pour into the prepared pan and bake for about 25-30 minutes, or until a toothpick inserted in the center comes out with a little batter and a few moist clumps clinging to it. Do not over bake. Remove from oven and let cool on a wire rack. Serve at room temperature or chilled.
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These freeze very well.