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Preheat oven to 350.
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Spray 9x13 baking pan with Pam. Layer cubed cake or donut chunks in the pan.
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In a bowl beat 4 eggs with a whisk. Then beat in milk, cinnamon and vanilla.
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Pour mixture evenly over cake or donuts.
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Let the mixture soak in for at least 15 minutes. If your cake or donuts were particularly stale, stir after 15 minutes and let sit for 15 more.
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If you are so inclined, weighting a dish on top of the mixture to press it down is an option.
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Slice butter in to pats and place on top before baking.
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Bake bread pudding for about 30 minutes or until it is set. A little less time for a convection oven.