Cook macaroni according to package directions for al dente.
Meanwhile, in a Dutch oven, heat butter over medium-high heat. Add garlic; cook and stir for 1 minute. Stir in the flour, mustard, salt and pepper until smooth; gradually whisk in the milk, beer and cream. Bring to a boil; cook and stir for 2 minutes or until thickened.
Reduce heat. Stir in 2 cups cheddar cheese, fontina cheese and 1 tablespoon Parmesan cheese until melted. Add chives.
Drain macaroni; stir into sauce. Transfer to a greased 3-qt. baking dish. Sprinkle with remaining cheddar and Parmesan cheeses.
Bake, uncovered, at 400° for 15-20 minutes or until golden brown and heated through. Top with crumbled bacon. Let stand for 5 minutes before serving.