In a large bowl, beat the sugar with the vegan butter and oil.
Add the yogurt, milk, and vanilla extract, mix until combined.
Add the flour, salt, and baking powder. Mix until creamy.
Grease a Bundt pan with butter or oil.
Pour 3/4 of the batter into the pan.
Add the cocoa powder to the remaining batter, mix to combine, and pour into the pan.
Use a knife to swirl the batters together.
Bake at 180 degrees C for 50-60 minutes.
Remove from pan and brush with simple syrup.