Heat 1 Tbsp. oil in large skillet on medium heat. Add onions; cook 15 to 20 min. or until tender and golden brown, stirring occasionally.
Place pizza dough on lightly floured baking sheet; stretch to fit 16 x 12-inch baking sheet. Mix garlic and remaining oil; spread onto dough. Bake 10 min.
Spread crust with cream cheese; top with remaining cheeses, onions and red pepper. Bake 10 to 12 min. or until crust is lightly browned.