Preheat oven to 350°F. Slice cookie dough as directed on package. Arrange slices in bottom of an ungreased 14-inch pizza pan. Using floured fingers, press dough evenly in pan. Bake until golden brown, about 15 minutes; cool. Spread marshmallow fluff over cookie crust, leaving a 1-inch border around the edges. Arrange blueberries and kiwi slices on top. Sprinkle with chopped walnuts.

Blueberry-Orange Dessert Pizza: Substitute 1 can (8 ounces) mandarin oranges, drained, and 1/4 cup coarsely chopped pistachios for the kiwi and walnuts.