Gently slice the King's Hawaiian rolls in half horizontally, being careful to keep them intact. Set the top halves aside for later.
In a large bowl, beat the softened cream cheese until it's smooth and fluffy. Add 1 teaspoon of vanilla extract and the ½ cup granulated sugar, continuing to beat until everything is well blended.
If using heavy whipping cream for the filling, whip 1 cup until stiff peaks form. Gently fold this whipped cream (or half of your store-bought whipped topping) into the cream cheese mixture until just combined.
Spread about two-thirds of this creamy cheesecake mixture evenly over the bottom halves of the rolls.
Lightly press the 1 pint of quartered strawberries into the cheesecake layer.
Carefully spread the remaining cheesecake filling over the strawberries.
Place the top halves of the rolls back over the cheesecake filling.
If using heavy whipping cream for the topping, whip the remaining 1 cup with ½ teaspoon vanilla extract and ¼ cup powdered sugar until stiff peaks form.
Spread the prepared whipped cream (or the other half of your store-bought whipped topping) evenly over the top of the rolls. You can spread some on the sides if you like!
Arrange the 1 pint of sliced strawberries and 1 pint of fresh blueberries on top. Get creative with a flag design for a patriotic touch, or simply scatter them beautifully!
Refrigerate the dessert until you're ready to enjoy.
For the best taste and texture, chill for at least 30 minutes. If using homemade whipped cream, serve within 2 hours of assembly.