Preheat the oven to 375F, and spray a 12 hole regular muffin tin with nonstick cooking spray.
In a bowl, whisk together the egg, egg whites (2T), and brown sugar until light and fluffy.
Add in the apple sauce and mashed banana and stir well.
Stir in the flour, baking powder, baking soda, and lemon zest.
In a separate bowl, use an electric mixer and beat together the cream cheese, sugar, egg whites (2T), milk, and vanilla.
Gently fold in the frozen wild blueberries.
Divy the muffin batter over the 12 muffin cups, then top each with the cream cheese mixture. Use a toothpick and swirl the cream cheese mixture slightly into the muffin batter.
Bake in the oven for 18-20 minutes until the edges look golden brown. Muffins will not rise too high.