Melt butter in an 11x7-in. baking dish in a 325° oven; tilt to coat bottom and sides. In a bowl, beat eggs, sour cream, milk and salt. Stir in onions. Pour into baking dish. Bake, uncovered, for 30 minutes or just until eggs are set. Place bacon in an 8-in. square baking dish. Pour syrup over. Cover and bake for 15 minutes or until heated through. Cut egg dish into squares and arrange on platter with Canadian bacon.