Meanwhile, in 3- or 4-quart saucepan, melt 3 tablespoons of the butter over medium heat. Add garlic; cook about 1 minute or until fragrant. With whisk, stir in flour and remaining 1/2 teaspoon salt until combined. Mix milk and whipping cream in glass measuring cup. Gradually stir milk mixture into flour mixture in saucepan. Increase heat to medium-high; heat to boiling, stirring constantly. Boil and stir 1 minute; reduce heat to medium. Stir in Parmesan cheese; cook 1 to 2 minutes, stirring occasionally, until melted.