Heat oven to 350°F. In 10-inch skillet, melt 3 tablespoons butter over medium-high heat. Add onions and apple; cook and stir until tender. Stir in remaining stuffing ingredients. In ungreased 15x10x1-inch pan, spread stuffing.
Split each game hen in half. Sprinkle lightly with salt and pepper. Place hen halves, skin side up, over stuffing. In 1-quart saucepan, melt jelly with 2 tablespoons butter over low heat; brush over hens.
Bake uncovered 1 hour to 1 hour 15 minutes or until hens are fork-tender and juice is clear when thickest part is cut to bone (180°F).