Add garlic; cook 2 min., stirring frequently. Stir in wine; bring just to a simmer.
Toss shredded cheese with cornstarch.
Add, 1/2 cup at a time, to wine mixture; cook 1 min. after each addition or until cheese is completely melted, stirring constantly. Stir in cream cheese spread; cook and stir 2 min. or until melted.
Add spinach; cook 2 min. or just until wilted, stirring constantly.