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Preheat oven to 325°F. Grease a 10- or 12-cup bundt pan. Sprinkle with 1/2 cups pecans.
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Stir together 1/2 cup sugar, cocoa, and cinnamon in a small bowl.
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Beat butter, cream cheese, and remaining 1 1/2 cups sugar in a large bowl until light and fluffy.
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Add eggs and vanilla, one at a time, beating well after each addition.
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Whisk together flour, cookies, and baking powder. Add to creamed mixture and beat until just combined (do not over-mix).
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Stir in remaining 1/2 cup pecans and blueberries.
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Spoon 1/3 of batter into prepared pan. Sprinkle 1/2 cinnamon-sugar mixture over batter. Repeat with 1/3 batter, remaining 1/2 cinnamon-sugar, and ending with 1/3 batter.
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Bake for 1 hour, or until a toothpick or cake tester inserted into center comes out clean.
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Cool cake in pan for 12 minutes. Remove cake from pan and cool completely on a wire rack. Top with marshmallow glaze.