Pre-heat oven to 350F (180C). Grease and flour a 10 inch (25cm) bundt pan.
In a large bowl whisk together the flour, baking powder and salt. Set aside.
In the mixing bowl beat (speed #3) together the sugar, eggs, egg yolk and vanilla until light and fluffy, about 3-4 minutes. Drizzle in the oil while continuing to beat (speed #2), add the flour and milk and beat on speed #1 when almost combined raise the speed to #3 and beat approximately 2 minutes until smooth.
Transfer the batter to the prepared ban and bake for approximately 40-45 minutes. Test with a toothpick for doneness. Let cool in the bundt pan before removing from the pan. Dust with powdered sugar before serving if desired. Enjoy!
Notes
For room temperature ingredients remove from the fridge 30-45 minutes before using.For homemade pastry flour for every cup of all purpose flour remove 2 tablespoons of flour and substitute with cornstarch, sift to combine well and remove any lumps, (you can use all purpose flour although pastry or cake flour makes a cake softer).