1. Place first four ingredients in a bowl; toss with 2 teaspoons oil, lime juice, cumin, 1/4 teaspoon salt and 1/8 teaspoon pepper. Refrigerate until serving.
2. Pat fillets dry with paper towels; sprinkle with the remaining salt and pepper. In a large nonstick skillet, heat remaining oil over medium-high heat; cook tilapia until fish just begins to flake easily with a fork, 3-4 minutes per side. Top with slaw and avocado.