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In a saucepan over medium heat, add butter, apple, brown sugar, apple pie spice, cinnamon and salt. Stir until soft, about 3 minutes.
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Add milk and increase heat to medium high until it comes to a gentle boil.
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Reduce heat to medium and add oats. Stir frequently until oatmeal is soft and milk is absorbed, about 5 minutes.
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Optional: stir in 1/4 c fairlife
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Top with walnuts or pecans and enjoy!