In a small bowl, mix together ½ cup + 2 Tablespoons heavy cream and 2 teaspoons white vinegar. Set aside.
In a medium mixing bowl, whisk together ½ cup all purpose flour, ½ Tablespoon granulated sugar, ½ teaspoon baking powder, ½ teaspoon baking soda, and ¼ teaspoon salt.
Add heavy cream and vinegar mixture, a scant Tablespoon of melted butter, and 1 egg yolk to dry ingredients. Mix together until just incorporated, it's ok if there are lumps.
(let batter sit for 30+ minutes for deeper flavor)
Heat a skillet over medium-low heat. Once hot, spray with cooking spray, or add butter to pan. Spoon about ¼-1/3 of batter onto skillet. You will make 3-4 pancakes. Cook until the top is covered with tiny bubbles. Bottom will be golden brown. Adjust heat if needed. Flip and cook 1-3 minutes, until other side is golden brown. Sides of pancakes should look cooked through.
Repeat until all batter is used up.
Enjoy immediately. Top with butter and syrup. Other toppings/fillings include: fruit, chocolate chips, nuts, etc.