In a small bowl, mix together your starter dough ingredients. Cover bowl with cling film. Microwave for 2 minutes. Remove cling film carefully as the bowl is hot. Allow this to cool.
In a large mixing bowl, combine your batter ingredients together.
Then add your starter dough to your batter with your hands. Knead this on a well-floured surface for at least 5 minutes until it's less tacky.
Roll your dough into a ball. Slice down the middle.
Then roll your two balls into tubes.
Cut the tubes into equal square pieces.
Roll the squares into little balls.
Then assemble your donut by sticking the balls together (5 per donut) on a square parchment paper.
In a small pot, add enough oil (about 2 inches in height) to cover the donut. Bring to medium heat.
Then slide your donut with the parchment paper underneath into the hot oil. Yes it's okay to do this to parchment paper. If you don't, your donut will come loose.
Fry on each side for 1.5 minutes until golden brown. Remove from hot oil and place on paper towel to soak up excess oil.
In a small bowl, mix your glaze ingredients. Dip your donut in and add sprinkles. Enjoy!