Preheat your oven to 180 degrees Celsius (350 degrees Fahrenheit). Grease and flour two round cake pans. In a large bowl, whisk together the flour, sugar, baking powder, and salt.

In another bowl, mix the eggs, orange juice, and vegetable oil until well combined. Pour the wet ingredients into the dry ingredients and stir until just combined. Divide the batter evenly between the prepared pans and smooth the tops.

Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted comes out clean. Allow the cakes to cool in the pans for 10 minutes before transferring them to a wire rack to cool completely.

In a medium saucepan, whisk together the eggs, granulated sugar, and lemon juice. Cook over medium heat, stirring constantly, until the mixture thickens and coats the back of a spoon, about 10-15 minutes.

Remove from heat and stir in the butter until melted and smooth. Transfer the lemon curd to a bowl and let it cool to room temperature before refrigerating until set.

In a large mixing bowl, beat the cream cheese and powdered sugar together until smooth. Add the vanilla extract and fresh blueberries, mixing gently to combine.

In another bowl, whip the heavy cream until soft peaks form, then fold it into the cream cheese mixture until fully incorporated. Set the filling aside and refrigerate until ready to assemble the cake.

Melt the white chocolate in a heatproof bowl over a pot of simmering water or microwave it in short bursts until smooth. Let it cool slightly.

In a separate bowl, whip the heavy cream until soft peaks form. Gently fold the melted white chocolate into the whipped cream until combined. This will create a light and fluffy cream for topping the cake.

Once the orange biscuit cakes have cooled completely, place one layer on a serving plate. Spread a layer of lemon curd on top, followed by the blueberry cheesecake filling.

Place the second biscuit layer on top and spread the white chocolate cream evenly over the entire cake. Decorate with additional blueberries or edible flowers as desired. Slice and enjoy your delightful Lemon Blueberry Cake!