1. Prepare the waffle batter by mixing flour, baking powder, sugar, milk, eggs, melted butter, and blueberries.
2. Cook the waffle batter in a preheated waffle iron until golden brown and fluffy.
3. In a bowl, mix cream cheese, sugar, lemon zest, vanilla extract, and heavy cream until smooth.
4. In a separate saucepan, cook fresh or frozen blueberries with sugar, lemon juice, and cornstarch to make a blueberry sauce.
5. Spread the cream cheese mixture onto one waffle, then layer with blueberry sauce.
6. Place another waffle on top, creating a sandwich-like structure.
7. In a bowl, whisk eggs, milk, and maple syrup to create an egg mixture.
8. Pour the egg mixture over the layered waffles, ensuring they absorb the liquid.
9. Cover and refrigerate overnight for best absorption.
10. Preheat the oven and transfer the soaked waffles into a baking dish.
11. In a saucepan, melt butter and brown sugar to create a caramel sauce.
12. Pour the brown sugar caramel sauce over the waffles before baking.
13. Bake until the waffles are golden brown and set.
14. Remove from the oven and let them cool slightly.
15. Serve warm with additional blueberry sauce, maple syrup, or a dusting of powdered sugar if desired.