– 2 cups all-purpose flour – 1 1/2 teaspoons baking powder – 1/4 teaspoon baking soda – 1/4 cup white sugar – 1/4 cup packed brown sugar – ½ teaspoon salt – 1 egg, near room temperature – 1 teaspoon vanilla extract – 1/2 cup sour cream, near room temperature – 1/2 cup milk, near room temperature – 1/4 cup unsalted butter, melted but cooled down a bit so it's not hot – 3 tablespoons vegetable oil – 1 cup mini chocolate chips