Season chicken with salt and pepper. In small skillet, melt butter; add onion and garlic and saute for a few minutes. Add paprika. Dip chicken in this mixture and coat well. Put in shallow baking dish. Bake in 375 F. preheated oven for 20 min. Cover with foil and bake 10 more minutes. Arrange drained hot broccoli around chicken. Put in peaches. Mix sour cream and mayonnaise and spoon over all. Sprinkle with poppy seeds and Parmesan cheese. Broil low in broiler for 6 to 8 min.