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In a medium pot over medium heat, combine milk, water and macaroni pasta. Season with salt and black pepper.
Stir frequently and bring to a simmer. Reduce the heat to low and stir for 8 to 10 minutes. You can add water if needed, ¼ cup at the time.
Remove the pot from the heat. Stir in grated cheddar cheese until it melts. Add garlic powder and adjust seasoning to your liking.