With a large fry pan, spray well with oil & place over stove on medium to high heat.
Add onion to the pan & cook for 3-4mins while stirring to soften.
Add garlic, sweet potato & cook for 2mins.
Add sausages, cook through well.
Add spinach & allow to wilt then add peas – stir through until all cooked & warm.
Add the beaten eggs to the pan & allow to spread out evenly, sprinkle with salt & pepper, cook for 5mins on the stove then transfer to the grill for a further 5mins, until golden & set.
Use a spatula & loosen & release the sides of the frittata from the pan, it should then slide straight onto a plate for serving.