Steps
1. In a bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
2. In another bowl, combine buttermilk, yogurt, egg yolk, melted butter, and vanilla extract.
3. Stir the wet ingredients into the dry ingredients just until combined; do not overmix.
4. In a clean bowl, beat the egg white until stiff peaks form.
5. Gently fold the beaten egg white into the batter to keep it airy.
6. Heat a non-stick skillet or griddle over medium heat and lightly grease it.
7. Pour 1/4 cup batter for each pancake onto the skillet.
8. Cook until bubbles form on the surface and edges look set, about 2-3 minutes.
9. Flip and cook for another 1-2 minutes until golden and cooked through.
10. Serve warm topped with fresh strawberries and whipped cream.