Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Prick the sweet potato with a fork and microwave for 4-5 minutes until tender, then slice into rounds.
In a small bowl, combine the almond flour, lemon zest, garlic powder, sea salt, and black pepper.
Pat the cod fillets dry with a paper towel and brush the tops with half of the olive oil.
Press the almond flour mixture firmly onto the top of the cod fillets to create an even, thick crust.
Place the cod, asparagus, and sweet potato rounds on the baking sheet, drizzling the vegetables with the remaining oil.
Bake for 12-15 minutes until the fish is opaque and flakes easily with a fork and the crust is golden.
Serve immediately with a fresh squeeze of lemon over the fish and vegetables.