Preheat oven to 400. Cut the puff pastry into 12 equal pieces.
Grease a 12-piece muffin tin and place one piece of dough into each hole. Gently pierce with a fork on the bottom. Brush the tops with whisked egg and bake for 15 minutes.
Take a spoon and gently push the sides out when it's warm so you can easily fill.
Prep the filling by blending the cottage cheese, cream cheese, sugar, and lemon juice. Pour into a bowl and stir in the cool whip. Place in a plastic bag and cut off the tip so you can pipe it into the puff pastry.
Top with fresh fruit. Store leftovers in the fridge.