Preheat oven to 350° F.
Place sliced onion in Fantasia 16 ounce oval glass casserole dish and spray lightly with vegetable oil cooking spray. Sauté in microwave until tender, approximately 2 to 3 minutes
Add raspberries, tomato paste and marmalade. Microwave until mixture comes to a boil, approximately 1 to 2 minutes.
Stir well and add chicken breasts. Spoon sauce over chicken, cover with
other 16 ounce Fantasia oval glass casserole dish and bake until chicken
is done (about 15 minutes.)