Creating Magnolia Bakery Blueberry Jamboree is simple if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking dish.
2. Prepare the Blueberries: Rinse the fresh blueberries under cold water. Set aside to drain.
3. Mix Dry Ingredients: In a bowl, sift together the all-purpose flour, baking powder, and salt. Set aside.
4. Cream the Butter and Sugar: In a large mixing bowl, cream the softened butter and granulated sugar until fluffy using an electric mixer.
5. Add Eggs and Vanilla: Beat in the eggs one at a time, mixing well after each addition. Add the vanilla extract and mix until smooth.
6. Combine Ingredients: Gradually add the dry ingredients to the wet mixture, alternating with a bit of cream cheese until just combined.
7. Mix in Blueberries: Gently fold in the blueberries, taking care not to break them apart too much.
8. Spread in Baking Dish: Pour the batter into the prepared baking dish and spread it evenly.
9. Bake: Place in the preheated oven and bake for 40-45 minutes, or until a toothpick inserted in the center comes out clean.
10. Cool: Once baked, remove from the oven. Allow it to cool in the pan for about 30 minutes before serving.
11. Prepare Cream Cheese Topping: While the Jamboree is cooling, beat together cream cheese, lemon juice, powdered sugar, and lemon zest until smooth.
12. Top and Serve: Spread the cream cheese mixture over the cooled Blueberry Jamboree, sprinkle with granulated sugar, and serve.

These detailed steps will ensure that you create the delightful Magnolia Bakery Blueberry Jamboree with ease and confidence!