1. Preheat your oven to 375 F (190 C). Line a large baking sheet with parchment paper for easy cleanup and to prevent sticking.

2. Unroll the crescent roll dough onto the prepared baking sheet. Press the seams together firmly to form a solid rectangular or circular crust. Bake for 8-10 minutes, or until the crust is lightly golden brown.

3. Remove the baked crescent roll crust from the oven and let it cool completely on the baking sheet. This step is crucial to prevent the cream cheese topping from melting and becoming runny.

4. In a medium mixing bowl, combine the softened cream cheese, granulated sugar, and vanilla extract. Beat with an electric mixer on medium speed until the mixture is smooth, creamy, and free of lumps.

5. Once the crust is completely cool, spread the cream cheese mixture evenly over the top, leaving a small border around the edges if desired.

6. If using, gently toss the fresh berries with lemon juice in a small bowl. Arrange the mixed berries decoratively over the cream cheese topping.

7. If desired, lightly dust the finished dessert pizza with powdered sugar just before serving for an extra touch of sweetness and a beautiful presentation. Slice into squares or wedges and serve immediately.