Preheat the oven 400°F. Line a baking sheet with parchment paper.
Pat the cod dry with paper towels and place in the middle of the sheet pan in a single layer. Add the cherry tomatoes on one side and the green beans on the other side. Season the cod and vegetables with salt and pepper to taste.
Drizzle the olive oil and lemon juice over the cod. Season with thyme and garlic powder. Use a brush or your hands to spread the marinade on the cod and brush any remaining marinade over the vegetables.
Place the pan in the oven and bake until the cod looks flaky and tomatoes begin to soften, about 12-15 minutes.
Serve the cod with the green beans and tomatoes over couscous or any other grains and spoon the juices from the baking dish over the cod.
Storage: Store any leftovers in an airtight container for up to 3 days.