Preheat your oven to 180°C (350°F) or 160°C (320°F) for fan ovens and line a baking sheet with parchment paper.

Peel and slice the sweet potatoes into thin rounds, about ¼ inch thick, and set aside.

In a large mixing bowl, combine the sliced sweet potatoes, spinach, feta, and beaten eggs; stir gently until well incorporated.

Transfer the mixture onto the prepared baking sheet and spread it evenly.

Bake in the preheated oven for 30-35 minutes until the top is golden brown and the edges are slightly crispy.

Allow to cool for a few minutes before slicing into squares or wedges.