Preheat the oven to 400°F and line a baking sheet with parchment paper.
In a small bowl, mix cumin powder, chili powder, salt, and pepper. Rub this spice mix over the tilapia fillet.
Place the seasoned tilapia on the baking sheet and lightly drizzle with olive oil.
Bake the tilapia for 12-15 minutes, or until the fish flakes easily with a fork.
While the fish is baking, prepare the lime slaw by combining shredded red cabbage, Greek yogurt, lime juice, salt, and pepper in a bowl.
Slice the avocado into thin pieces.
Warm the whole wheat tortillas on a dry skillet for 30 seconds on each side or until pliable.
Assemble the tacos by placing chunks of baked tilapia onto each tortilla, topping with a generous serving of lime slaw, and finishing with avocado slices.
Serve immediately and enjoy your fresh, crispy baked fish tacos.