Place unwrapped packages of cream cheese in a 2-quart glass measure. Microwave on medium (50 percent) 2 1/2 minutes. Blend in curry powder and sherry. Fold in Cheddar and 3/4 of onion; mix well. Spoon mixture onto serving platter in an 8-inch circle. Use a spatula to form a tart shape, building up sides while indenting the top surface area to form a "well." Place chutney in blender and puree to uniform mixture. Pour in "well" area of cheese tart. Chill until firm. To serve, garnish top with remaining onion. Accompany with orackers. Nutritional analysis per serving with crackers: 121 calories, 9 grams fat, 4 grams carbohydrates. 31 milligrams cholesterol. 196 milligrams sodium, 69 percent of calories from fat. Fort Worth Star Telegram -Food section -29 November 1995