Heat the oven to 180C/160C fan/gas 4. Put the baking dish of cheese on the top shelf and the baguette slices on the shelf below. Bake for 15 mins, then turn each slice of bread over and return to the oven for a further 10 mins, or until the ricotta is slightly golden at the edges and the bread is crisp. Alternatively, if using an air fryer, heat it to 180C and bake the slices of baguette for 6-8 mins, until crisp, turning halfway. Remove the bread and put the baking dish in the basket. Bake for 10-15 mins, or until the ricotta is lightly golden at the edges.