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1
In a mixing bowl, combine cocoa and baking soda; blend in 1/3 cup melted butter.
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2
Add boiling water, stirring until thickened.
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3
Stir in sugar, eggs, vanilla, and remaining butter.
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4
Add flour, cinnamon, and salt.
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5
Fold in the chocolate chips.
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6
Pour into a greased 13x9-inch baking pan.
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7
Bake at 350F for 40 minutes or until a toothpick inserted near the center comes out clean.
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8
For Frosting: Cream butter in a mixing bowl.
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9
Combine cocoa, sugar, and cinnamon; add alternately with the milk.
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10
Beat to a spreading consistency; add vanilla.
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11
Add more milk if necessary.
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12
Spread over brownies.
