Preheat your oven to 425°F and line a large baking sheet with parchment paper.
Slice the russet potato into thin, even wedges and place them in a bowl.
Toss the potato wedges with half of the avocado oil and a pinch of sea salt, then spread them in a single layer on the baking sheet.
Roast the potatoes for 15 minutes, flipping halfway through to ensure even browning.
While potatoes roast, pat the cod fillets completely dry with a paper towel.
In a shallow dish, combine the almond flour, garlic powder, paprika, sea salt, and black pepper.
Press each side of the cod into the almond flour mixture until well-coated.
Move the potatoes to one side of the baking sheet and place the fish on the other side, drizzling the remaining oil over the fish.
Bake for an additional 10 to 12 minutes until the fish flakes easily with a fork and the potatoes are golden and crisp.
Garnish with fresh parsley and serve immediately with a fresh lemon wedge.