Cake: Preheat oven to 325 degrees F. Grease and flour 12-cup Bundt pan. Sprinkle granola on bottom of pan.
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Combine brown sugar, sour cream and one egg. Beat until blended. Sift cake mix and alternately add cake mix and one egg at a time. Blend until mixed and continue to slowly add the remaining ingredients including oil and rum. Beat for 2 minutes on hig
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Bake for 1 hour. Cool in pan. Invert on serving plate. Prick top with fork. Drizzle glaze over top of cake. Use brush or spoon to put extra dripping back on cake.
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Glaze: Melt butter in saucepan. Stir in brown sugar, granola cereal and walnuts. Dissolve cornstarch in a few tablespoons of water and add to mixture. Boil 5 minutes, stirring constantly. Remove from heat and stir in rum. Note: The rum will cause ste