Preheat oven to 400°F and line a large sheet pan with parchment paper.
Place the cod fillets, trimmed asparagus, sliced zucchini, and sliced bell peppers on the pan.
In a small bowl, whisk together melted ghee, olive oil, lemon juice, zest, garlic powder, oregano, salt, and pepper.
Drizzle the herb mixture over the fish and vegetables, tossing the veggies to coat evenly.
Roast for 12-15 minutes until the fish is opaque and flakes easily with a fork.
While roasting, toast the slivered almonds in a dry pan over medium heat until golden and fragrant.
Serve the roasted fish and vegetables topped with sliced avocado, crumbled feta, olives, and the toasted almonds.