Preheat oven to 350 degrees F. Grease one large loaf pan.

In a large bowl, combine flour, baking powder and salt. Set aside.

In a medium bowl, whisk together the sugar, yogurt, oil, eggs, and vanilla.

Add the wet ingredients to the dry and stir to combine.

Pour into loaf pan and gently wiggle to distribute evenly. Arrange rhubarb on top and sprinkle with the turbinado sugar.

Bake for 45-55 minutes. Use a toothpick or cake tester to determine whether the cake is cooked all the way through.