HEAT oven to 350°F.
MASH beans with lemon juice in medium bowl. Add artichokes and mayo; mix well. Stir in cheese, garlic and 2 Tbsp. onions.
SPOON into 9-inch quiche dish or pie plate. Crush 4 crackers; sprinkle over spread. Top with remaining onions.
BAKE 20 to 25 min. or until hot and bubbly. Serve with additional RITZ Crackers.