1. Heat waffle iron. In a bowl, beat heavy cream with 2 tsp sugar to stiff peaks. Set aside.
2. In a large bowl, whisk together flour, remaining 2 tbsp sugar, the baking powder and salt. In a separate bowl, stir together milk, butter, egg yolk and vanilla. Pour wet mixture into dry mixture and stir until just combined. Place egg whites in another bowl and beat with a hand mixer on high until fluffy. Fold into batter.
3. Ladle batter into waffle iron (about 1/2 cup per waffle). Cook according to manufacturers directions. Repeat with remaining batter. (Makes about 6 standard waffles.)
4. Top each warm waffle with 1 tbsp chocolate-hazelnut spread, 1/3 cup sliced bananas, 1/3 cup sliced strawberries and whipped cream.