Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.

In a bowl, combine mashed potatoes, green onions, nutritional yeast, flour, salt and pepper. Mix until it forms a soft, shapeable dough.

Scoop and flatten into small patties.

Place patties on the parchment-lined sheet.

Bake for 20–25 minutes, flipping halfway, until golden and lightly crisp on the edges.