HEAT oven to 375°F. Stir apples, cranberries, 1/4 cup brown sugar and cinnamon until coated. Spoon evenly in 9 x 9-inch baking pan.
MIX flour, wheat germ and 1/4 cup brown sugar in medium bowl. Cut in peanut butter with fork until crumbs form. Stir in walnuts. Crumble over apples.
BAKE 35 to 40 minutes or until apples are fork tender and top is golden brown. Cool 10 minutes. Drizzle with caramel sundae syrup, if desired. Serve warm.