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For gluten-free: mix one tablespoon of cornstarch with one tablespoon water to make a cornstarch slurry. Make sure the cornstarch is fully dissolved. Now continue with instructions in step 4. Melt the butter, add the cornstrach slurry, and whisk until it's light brown.Pour the milk and continue whisking until the cornstarch roux is smooth and thick. Add the roux to the large pot and stir to combine.