In a large bowl, whisk together flour, baking powder, baking soda, salt, and sugar.
In a medium bowl, whisk together eggs, egg yolk, melted butter, sour cream, light cream, and vanilla extract.
Pour wet ingredients over dry ingredients and add chocolate chips. Using a wooden spoon or spatula, stir together just until combines. Batter should be fairly thick. Add additional cream 1 tablespoon at a time if batter is too thick.
Heat a griddle or large nonstick skillet over medium-high heat. Wipe surface with butter and pour a scant 1/4 of batter onto griddle for each pancake. Cook until bubbles appear on top and flip.
Cook about 1 additional minute, or until set all the way through.
To serve, dust with confectioners’ sugar and serve with maple syrup.