Combine the flour and baking powder; set aside. In a large bowl, whisk the egg, then add in the milk, cream, sugar, oil, and salt, and whisk together. Once they are combined, add in the flour and baking soda, stirring to combine. Fold in the blueberries and stir until they are evenly distributed throughout the batter. Be careful to not overmix the batter.
1½ cups all-purpose flour, 1 tablespoon baking powder, 1 large egg, 1 cup milk, ½ cup heavy cream, 2 tablespoons granulated sugar, 2 tablespoons vegetable oil, ¼ teaspoon kosher salt, ¾ cup blueberries