HEAT oven to 375°F.
MIX first 4 ingredients in large bowl. Stir in 3/4 cup Cheddar and 1/2 cup cracker crumbs.
SPOON into 2-L casserole dish sprayed with cooking spray; top with remaining cracker crumbs and cheese.
BAKE 20 to 25 min. or until crumb topping is golden brown and cheese is melted.