- 5 tbsp. unsalted butter
- 1/2 cup all-purpose flour
- 4 cups warm whole milk
- 1/2 tsp. salt
Melt butter over medium heat. Add the flour and whisk until smooth, about 2 minutes. Gradually add the warm milk, whisking constantly to prevent any lumps from forming. Simmer over medium heat, whisking constantly, until the sauce is thick, smooth, and creamy – about 10 minutes (do not allow to boil). Remove from heat and stir in salt and pepper, pinch of nutmeg.