Combine the self-rising flour and vanilla yogurt in a large mixing bowl.
Stir with a silicone spatula until a shaggy dough forms.
Lubricate hands with melted coconut oil or plant-based butter.
Knead by hand until a soft, elastic dough ball is achieved.
Divide the dough into eight equal portions.
Roll each portion into a ball and smooth with a little extra oil.
Press your thumb into the center of each ball to form a donut shape.
Air fry or bake until golden brown and cooked through.
Brush with melted dairy-free butter and coat with cinnamon sugar mixture.