Preheat oven to 180°C (160°C fan-forced). Line 8 x 1/2 cup capacity muffin tin with baking paper or muffin cases.
Cut or break the bread into small chunks and put in a mixing bowl. Pour the milk over the top and leave the milk for about 10 minutes to soften the bread.
Whisk together the egg, ricotta, thyme and a little salt and pepper.
Stir in the grated cheese.
Pour the cheese mixture over the milk-soaked bread.
Spoon the bread mixture into the muffin tin and bake for 25-30 minutes until the puddings are set.
Serve immediately while still warm, or at room temprature.
Store in an airtight container. The muffins are best eaten within 24 hours. They are suitable to freeze.