Cook and drain gnocchi as directed on package. Meanwhile, in 2-cup glass measuring cup, mix milk and whipping cream. In 4-quart or larger Dutch oven, melt remaining 2 tablespoons butter over low heat. Add garlic; cook about 30 seconds, stirring frequently. With whisk, stir in flour and salt until smooth. Increase heat to medium; cook and stir until mixture is smooth and bubbly. Gradually stir in milk mixture. Heat to boiling, stirring constantly. Boil and stir 1 minute; reduce heat to medium. Stir in fontina, Cheddar and 1/4 cup of the shredded Parmesan. Cook until melted, stirring occasionally. Stir gnocchi into cheese sauce. Remove from heat. Pour mixture into baking dish. Sprinkle bread crumbs and remaining 1/4 cup shredded Parmesan over pasta mixture.