Flavor Miso Magic (Marinate): In a small bowl, whisk together the white miso paste, mirin, soy sauce, grated ginger, maple syrup (or honey), and sesame oil until smooth.
Cod Marinate Time: Pat the cod fillets dry with a paper towel. Place them in a shallow dish or a zip-top bag. Pour the miso glaze over the cod, ensuring both sides are coated. Marinate in the refrigerator for at least 30 minutes, or up to 1 hour (longer can make it too salty).
Preheat & Prep: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper for easy cleanup.
Cod Bake Off: Remove the cod from the marinade (discard excess marinade). Place the cod fillets skin-side down (if skin-on) on the prepared baking sheet.
Bake Beautifully: Bake for 10-12 minutes, or until the fish is flaky and cooked through. For an extra caramelized glaze, you can briefly broil for the last 1-2 minutes, watching carefully to prevent burning.
Veggie Time: While the cod bakes, heat the avocado oil in a large skillet or wok over medium-high heat. Add the sliced shiitake mushrooms and sauté for 3-4 minutes until softened and slightly browned.
Bok Choy Brilliance: Add the bok choy (cut-side down first for a nice sear) to the skillet. Cook for 2-3 minutes, then add the minced garlic and grated ginger. Sauté for another minute until fragrant.
Soy Glaze Finish: Pour in the soy sauce (and mirin/red pepper flakes if using) over the vegetables. Toss quickly to coat and cook for just another minute until the bok choy is tender-crisp.
Assemble Your Plate: Carefully transfer the Miso-Glazed Cod to serving plates. Arrange the sautéed bok choy and shiitake mushrooms alongside.
Garnish & Glow: Sprinkle with sesame seeds and chopped green onions or cilantro for a beautiful finish. Serve immediately and prepare for pure culinary bliss!