Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Toss the French green beans with 0.5 tablespoons of olive oil, a pinch of sea salt, and black pepper.
Spread the beans in a single layer and roast for 12 to 15 minutes until they are tender and slightly charred.
Pat the tilapia fillets dry with a paper towel and season both sides with garlic powder, dried oregano, sea salt, and black pepper.
Heat the remaining 0.5 tablespoons of olive oil in a large non-stick skillet over medium-high heat.
Add the tilapia to the skillet and cook for 3 to 4 minutes per side until the fish is opaque and flakes easily with a fork.
Reduce the heat to low and add the ghee, lemon juice, and lemon zest to the pan, swirling to melt and combine.
Spoon the warm lemon butter sauce over the fillets and garnish with freshly chopped parsley before serving with the roasted beans.