Melt 2 Tbsp. butter in Dutch oven or large deep skillet on medium heat. Add garlic; cook and stir 1 min. Add flour; cook and stir 1 min. Gradually whisk in milk. Bring to boil, stirring constantly. Continue to cook and stir 2 to 3 min. or until thickened. Add Italiano cheese; cook 1 to 2 min. or until melted, stirring constantly. Remove from heat. Add kale and cooked vegetables; stir until evenly coated with sauce.