Place your hand mixer beaters and bowl in the fridge for 1 hour before making the frosting.
Also rinse and lay the berries out on paper towels so that they’ll dry. Place some paper towels on top, as well, to really soak up any water. This will prevent the cheesecake mixture from getting runny.
In a large mixing bowl using an electric hand mixer at medium power, beat the cream cheese, sugar, vanilla and salt until totally combined.
8 ounces (225 grams) cream cheese, 1 1/4 cups (150 grams) powdered sugar, 1 teaspoon vanilla extract, 1/8 teaspoon salt
While still mixing, now on low, gradually add the heavy cream.
1 cup (240 ml) heavy cream
Once it’s well incorporated, turn the speed to high and beat until stiff peaks form - about 3 to 5 minutes.
Reserve 1/2 cup strawberries, 1/3 cup blueberries, and 1/4 cup blackberries for the top.
1 pound (2 3/4 cups or 455 grams) fresh strawberries, 12 ounces (2 1/3 cups or 340 grams) fresh blueberries, 6 ounces (1 1/4 cups or 170 grams) fresh blackberries
Very gently fold the remaining berries into the cheesecake mixture.
Transfer to a serving bowl and top with the reserved berries. Serve immediately.
You can make the cheesecake filling up to 3 days in advance. Keep it refrigerated in an airtight container. Then prepare the berries the day of serving and stir them into the cheesecake filling just before serving. The salad will keep for a few hours at room temperature.