Preheat the oven to220°C/200°C fan
To make the pizza dough, put the flour, yeast and salt into the bowl of a stand mixer.
Add the olive oil and warm water and, using a dough hook, knead for 5 minutes or until the dough is smooth and elastic.
Transfer the dough to a greased bowl, cover and stand in a warm place for at least 1 hour or until the dough has doubled in size.
Meanwhile, dust 2 large baking trays with semolina
Take the dough out of the bowl and transfer to a lightly floured surface. Knock the air out of the dough and then cut it in half.
Roll each half out to approx. 20-40cm ovals and then transfer to the prepared baking trays.
Combine the sausage meat with 2 tbsp of olive oil and dot onto the pizza bases.
Scatter over the potato and onion slices, Cheddar cheese, Mozzarella and thyme sprigs.
Drizzle with a little olive oil and bake the pizzas in the preheated oven for 20-25 minutes or until cooked.