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Preheat the oven to 375F; spray a 10-inch tube or bundt pan with cooking spray.
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To make the cake:.
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Sift together the flour, baking powder, baking soda and cinnamon; set aside.
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Beat the brown sugar and butter in a large bowl with an electric mixer until fluffy.
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Add the eggs and beat well.
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Combine the bananas, milk and rum in a small bowl.
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Add the flour mixture alternately with the banana mixture to the batter, beating at medium speed after each addition.
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Pour into prepared pan, spreading evenly.
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Bake for 1 hour or until wooden pick inserted in center of the cake comes out clean.
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Cool in the pan for 15 minutes.
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Remove from the pan to a wire rack; cool completely.
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To make the glaze:.
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Combine the confectioner's sugar, rum and butter in a small bowl, mixing until smooth.
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Drizzle over the top of the cake.