Prepare Blueberry Topping: In a medium saucepan, combine one pint of blueberries, granulated sugar, brown sugar, and water. Cook over medium heat until the mixture begins to bubble, stirring occasionally for about 5 minutes. Once bubbly, stir in a cornstarch slurry to thicken and cook for another 2-3 minutes until the topping has a jam-like consistency. Remove from heat, fold in the remaining fresh blueberries, lemon zest, and lemon juice, then cool in the fridge.

Bake Crust: Preheat your oven to 325°F (160°C). In a mixing bowl, combine melted butter, all-purpose flour, and chopped pecans until the mixture resembles a crumbly dough. Press this mixture evenly into a greased 9x13-inch baking pan. Bake for 15 minutes or until the crust is golden around the edges, then let it cool completely at room temperature before adding the filling.

Whip Cream: In a large bowl, pour in the heavy whipping cream and add vanilla extract. Using an electric mixer, whip the cream until soft peaks form, which should take about 3-5 minutes. Take care not to over-whip, as you want a light and airy texture. Set the whipped cream aside as you prepare the cream cheese filling for your Blueberry Jamboree.

Beat Cream Cheese: In another mixing bowl, beat the softened cream cheese and powdered sugar together using an electric mixer. Mix until smooth and creamy, which should take about 2 minutes. This mixture forms the rich base of the filling for your Blueberry Jamboree. Be sure to scrape down the sides of the bowl for even blending.

Combine Filling: Gently fold the whipped cream into the cream cheese mixture using a spatula until just combined, being careful not to deflate the whipped cream. This creates a light and fluffy filling that will perfectly complement the buttery crust and sweet blueberry topping. Spread the filling evenly over the cooled crust with a spatula, smoothing it out.

Assemble & Chill: Once your filling is spread, take the cooled blueberry topping from the fridge and carefully spoon it over the cream cheese layer, spreading it evenly. Cover the assembled Blueberry Jamboree with plastic wrap and refrigerate for at least 2 hours or overnight for the best results. This chilling time ensures the dessert sets beautifully, making it ready for serving at your summer gatherings.