Boil the potatoes in salted water until tender. Add the peas for the last few minutes.

Meanwhile, fry the red pepper and shallots until soft, then add in the shredded kale and cook until wilted.

In a large bowl whisk together the eggs, cream, cream cheese and wholegrain mustard. Add the leaves from the thyme sprigs and plenty of salt and pepper. Stir through about half the feta, crumbled into chunks.

Fish out the potatoes from the peas. Drain the peas and tip into the egg and cheese mixture. Add the peppers and kale mixture too, with salt and pepper if needed. Put the oven or grill on.

Slice the potatoes and fry in olive oil in the same pan you used for the peppers, until crispy and golden. Add into the egg mixture. Put an ovenproof frying pan on the heat and add some oil. When hot, pour in the frittata mixture.

Shake the pan so the mixture settles evenly but don't stir or interfere with it in any way. Add the rest of the feta in lumps and push into the egg mixture, then sprinkle over the grated Parmesan. Cook for about 8-10 minutes until it seems set.

Place in the hot oven, or under the grill for 3-4 minutes until golden on top. Leave to cool for a while before eating with salad