Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together the egg, sea salt, black pepper, curry powder, mashed sweet potatoes, flour, and dried thyme until fully combined.
Using a ¼ cup measure, portion out six mounds onto the prepared baking sheet and flatten gently with a spatula.
Brush each patty with melted butter and bake for 15 minutes. Flip each patty, brush again with butter, and bake for an additional 10 minutes until golden brown.
While baking, prepare the dipping sauce by mixing mayonnaise and mixed herbs in a small bowl.
Serve the patties immediately with herb mayo and a sprinkle of fresh herbs.
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Notes
Store leftovers in an airtight container in the refrigerator for up to three days. Reheat in the oven for best results.