Preheat oven according to package directions. Lightly grease a large rimmed baking sheet, approximately 12x17.
Prepare sugar cookie dough according to package directions. If it gives you the option of making drop cookies or roll out, use the drop cookie instructions. Spread evenly into rimmed cookie sheet.
Bake according to package directions, plus an additional 8-10 minutes or until the whole giant cookie is lightly brown.
Allow to cool fully and frost.
Do not add fruit until 3-4 hours before serving. Carefully eyeball the cake in half. In the top left hand corner, add 50 blueberries. Break cake into 7 stripes, add strawberries.
Refrigerate until ready to serve.
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