4 tablespoons butter
Combine melted ice cream with next 4 ingredients in large shallow pan. Dip raisin bread into ice cream-egg mixture and let soak 1 minute per side.
Melt 2 tablespoons butter in heavy large skillet over medium heat. Place 4 bread slices in skillet and cook until brown, about 2 minutes per side. Repeat with remaining butter and bread. Serve immediately with maple syrup and additional ice cream.