In a medium bowl, whisk together the apple cider, maple syrup, soy sauce, brown sugar, white wine vinegar, thyme, salt, and pepper until the sugar dissolves.
Place the sea bass portions in a shallow dish or a resealable bag and pour the mixture over them. Make sure the fish is coated well, then cover and place in the refrigerator for about 15 minutes to let the flavor soak in. You can leave it up to overnight for the most optimal flavor.
Preheat your oven to 425°F on your roasting setting if you have it.
Place the fish in a oven safe pan that's big enough for the 4 fillets and coat in the sauce fully
Bake on the top rack, basting and rotating the pan half way through cooking.
Once the fish begins to carmelize on top and starts to show signs of flakiness, it’s done.
Take it out of the oven and spoon the rest of the glaze over the top. Serve right away while it’s warm and glossy. You can sprinkle a little sliced green onion on top if you’d like to make it extra pretty.