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Preheat Oven to 350 Degrees F., Rack in the Middle Position.
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For the crust, Mix the dry ingredients together and then cut in the softened butter.
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(You can also do this in a food processor with a steel blade, using chilled butter that's been cut into chunks.) Spread the mixture out on
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the bottom of a 9 inch by 13 inch cake pan and press it down with a spatula. Bake at 350 Degrees F. for 15 Minutes. (Don't shut off the
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oven - you'll need it for the second step.)
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To make the filling, You can do this by hand, but it's a lot easier with an electric mixer.
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Soften the Cream Cheese and beat it with the Mayonnaise until it's
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smooth. Gradually add the Sugar. Add the Eggs, one at a time, beating
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after each addition. Melt the Chocolate Chips in a microwave safe bowl
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for 3 minutes. (Chocolate Chips may retain their shape, so stir them to
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see if they're melted.) Let them cool for a minute or two, and then
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gradually add the chocolate, mixing thoroughly. Then mix in the Vanilla.
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Pour the finished mixture on top of the crust you just baked. Bake at
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350 Degrees F. for 35 Minutes. Let it cool to room temperature. Make the glaze: In a small saucepan, combine the butter, corn syrup and water. Cook over low heat, stirring constantly. Bring to just boiling; remove from heat. Add the chocolate chips; stir until they are melted and the mixture is smooth. Cool to room temperature.
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Pour the glaze over the top of the cake and chill for at least 4 hours. Cut into small squares.