Preheat the oven to 180C/350F. Line a large baking tray with parchment paper and set aside.
In a large mixing bowl, combine the flour and yogurt and mix well until combined. If the dough is too thick, add extra yogurt. If the dough is too thin, add more flour. If using cheese, fold it through at the end.
Lightly flour a kitchen surface. Transfer the dough into it and divide them into eight equal portions. Shape them into mounds and place them on the lined baking tray.
Bake the biscuits for 17-19 minutes, or until the tops are golden brown and the edges are firm. Remove the biscuits from the oven and serve immediately, or let them cool completely.
Notes
Gluten-free: For gluten-free biscuits, use gluten-free self-rising flour and increase the bake time by 5-7 minutes. I tested these using the Dove Farm brand. Cheese: I added 1/2 cup of shredded cheese, but that is completely optional. Leftovers: Keep at room temperature for 3 days or in the fridge for one week.