Grease a 12 hole muffin tin with the olive oil. It is easiest to dip a piece of kitchen roll into the olive oil and use that to rub the olive oil around each hole.
Boil the kettle. Put the peas in a jug or bowl and cover with boiling water. Leave for 2 minutes, then pour into a colander and drain.
Cut the feta into small pieces (about half a centimetre in size).
Crack the eggs into a large bowl. Add the pesto and stir well until the eggs are fully mixed. Add the feta and peas and stir again.
Spoon the mixture evenly into the muffin tin. Put in the oven for 20 minutes until risen, set and golden.