For the crust, add all the ingredients into a mixing bowl and mix the ingredients either using hands or an electric mixer (mix at the lowest level) until a non-sticky dough is form. If it is sticky, add in some flour.
Dust a little flour over the bottom of a small bowl and transfer the pizza dough into the bowl.
Cover the bowl with a suitable lid to prevent the dough from drying. Thereafter, keep the bowl in a warm place (about 21 °C - 23 °C).
After 2 - 8 hours, check if the bread dough has risen (it does not have to be double in size). Once it has risen, stretch and fold all sides of the dough with your hands. If the dough gets too sticky, spread very little all-purpose flour to ease the folding.
After which, cover the baby pizza cupcake dough again and repeat step 3. Once the sourdough bread rises for the second time after about 2 - 8 hours, repeat step 4 and 3 once more.
Preheat baking oven to 250 °C.
When the dough rests for the third time after 2 - 6 hours, spread a little flour onto your working space and transfer your sourdough bread from the bowl to your working top using a dough scraper.
Roll the pizza dough with a rolling pin until desired thickness. My family prefers thin pizzas.
Use a cup (diameter about 8 cm) to cut circles out of the dough. Dust a little flour over the cupcake baking tray and transfer the dough into each cupcake mould.
Spread some tomato sauce onto the dough and add some cheese over the sauce. Leave the toppings as it is or add more toppings such as mushrooms, zucchini.
Reduce the heat of the baking oven to 200 °C. Bake the baby pizza cupcakes for 8 to 10 minutes.
After baking, place the baking tray on a cooling tray and allow it to cool down for a few minutes. Thereafter, remove each baby pizza from the cupcake mould and enjoy!