Preheat your oven to 350ºF (175ºC) and lightly grease an 8 x 8 inch square baking pan.
Melt the vegan butter and pour it over the brown sugar in a medium bowl, stirring to coat.
Add the vanilla, yogurt, and creamer, and stir until homogeneous.
Slowly incorporate the flour along with the baking powder, stirring just enough to arrive at a smooth mixture.
Pour the batter into your prepared pan. Bake for 25 to 30 minutes, until the sides just begin to pull away from the pan and the top is fairly firm.
The blondies may still be slightly gooey on the inside, but they will continue to cook once removed from the oven. Besides, they are “fudgy” bars, so you don’t want them to dry out! Wait for the blondies to cool completely before cutting.