4 Tablespoons unsalted butter melted and cooled at least 5 minutes (57g)
¼ cup canola oil may substitute vegetable oil (60ml)
1 cup sugar (200g) (granulated sugar)
1 large egg + 1 egg white room temperature preferred
1 1/2 teaspoon vanilla extract
1/2 cup buttermilk* room temperature preferred -- please see note for buttermilk substitute
1 3/4 cup flour 220g
2 teaspoons baking powder
2 teaspoons corn starch
½ tsp salt
1 cup chocolate chips I used a mix of mini and regular sized, but you can use either or a combination (175g)
1/3 cup additional granulated sugar, coarse sugar preferred for topping (67g)