Heat 1.5 cups milk in a large heavy saucepan over medium high heat until steaming. Whisk remaining 1/4 cup milk and flour in a small bowl until smooth. Add to the hot milk and cook, whisking constantly, until the sauce simmers and thickens, 2-3 minutes. Remove from heat and stir in cheddar cheese until melted. Stir in cottage cheese, nutmeg, salt, and pepper.
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