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Cook macaroni according to package directions.
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Grate the cheese, mix the two cheeses together BUT reserve 1 1/2 cup of Fully Loaded without the yellow cheddar.
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Stir together cream, next 9 ingredients (whiskey included, if using) until combined in a large bowl.
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Pour over cooked macaroni, mix well.
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Add in 2 1/2 cups cheese to the large bowl, stir until well combined, will be soupy.
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Spray the inside of the slow cooker (or use a slow cooker liner) with cooking spray.
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Pour macaroni mixture in a 6-qt. slow cooker.
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Sprinkle with remaining 1 1/2 cups cheese over macaroni mixture.
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Cover and cook on HIGH 3 hours; reduce slow cooker to LOW, and cook 1 hour. ****SEE NOTES