Make sugar cookie base: Cream butter and sugar, then add remaining ingredients. The mix will be crumbly.
Press sugar cookie dough into half-sheet pan. It will be about 1/4" thick. Preheat oven to 400 degrees. Bake until edges start to brown. Let cool.
Whip cream cheese and sugar until light and fluffy. Add Cool Whip. Refrigerate until cookie base is cool.
Rinse and dry strawberries and blueberries. Cut strawberries as desired.
Spread a thin layer of frosting over cooled cookie base. Decorate with fruit as desired. Pipe remaining frosting into openings. Chill until time to serve.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.