Heat the oil in a skillet over a medium heat and add the prosciutto. Cook for 2-3 minutes or until crisp and golden. Remove from the pan with a slotted spoon and set to one side.
Step 2
Crack the eggs into a mixing bowl and add the cheeses, salt and pepper. Beat together to combine leaving small chunks of mascarpone in the mixture.
Step 3
Pour the beaten egg mixture into the skillet and leave to settle and cook over a medium heat. Once the egg has cooked around the edges, use a spatula to carefully ease the cooked egg away from the sides of the pan, allowing any uncooked egg to flow underneath.
Step 4
Once the omelette is set and cooked through, carefully slide onto a plate and top one side with the crispy prosciutto and scatter over the fresh basil. Fold in half to serve.