Preheat the oven to 375F. Line a baking tray with parchment paper.
Place the egg in a shallow dish.
Place the panko, chili powder, garlic powder, cumin, and salt in a second dish. Dip the cod pieces into the egg, and then press into the breadcrumb mixture to coat. Transfer to the baking tray, and spray with cooking spray.
Bake fish for 10 to 12 minutes.
Meanwhile, combine the red cabbage, cilantro, olive oil, greek yogurt, lime zest, juice, and sea salt in a medium bowl. Toss to evenly distribute.
Assemble the tacos with fish, slaw, avocado and salsa. Serve with lime wedges.