Mix eggs, oil and thawed berries with the cake mix. Mix 300 strokes by hand or 3 minutes with a mixer. Pour into 9 x 13 greased and floured pan. Bake at 325 degrees for approximately 50 minutes. When cooled frost with a mixture of 3 ounce package softened cream cheese mixed with 1 teaspoon vanilla and 1 tablespoon butter or margarine.