1.Preheat oven to 180°C. Oil a 20cm x 30cm rectangular pan; line base with baking paper, extending paper 5cm over long sides.
2.Place asparagus, zucchini and peas in a small saucepan of boiling water. Return to the boil; drain immediately, transfer to a bowl of iced water until cold. Drain well, then pat dry with paper towel.
3.Whisk eggs and cream in a large jug until combined. Add mint; season.
4.Place feta and vegetables in pan; pour over egg mixture.
5.Bake frittata for 25 minutes or until set. Cool before cutting into slices.
You can start cooking this frittata in an oiled ovenproof frying pan on the stove top and finish it under the grill (broiler). To make ahead, store cooled frittata, covered, in the fridge for up to 2 days. The frittata can be eaten warm or at room temperature. To reheat frittata, microwave on HIGH (100%), in batches, for about 1 minute.