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Preheat oven to 350 degrees F. Grease and flour a 12-cup bundt pan.
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Whisk together flour, cinnamon, baking soda, and salt in a medium bowl.
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Beat butter, brown sugar, granulated sugar, and vanilla in a large bowl until light and fluffy.
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Add eggs, 1 at a time, mixing well after each addition.
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Add flour mixture in three additions, alternately with buttermilk in two additions, mixing on low speed until just combined. Do not over mix.
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Stir in chocolate chips. Spread batter evenly in prepared pan.
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Bake for 50 to 55 minutes, or until a toothpick or cake tester inserted in the center comes out clean.
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Cool cake in the pan for 10 minutes. Remove cake from pan and cool completely on a wire rack.
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Top with glaze and garnish with chocolate chips.