Created by breezermom on April 8, 2015
Step 1: To prepare shrimp, combine shrimp, garlic powder, cumin, and 1/4 teaspoon salt in a bowl. Let stand 10 minutes.
Step 2: To prepare black bean salsa, combine green onions and next 7 ingredients (through beans) in a medium bowl; toss to coat.
Step 3: To prepare avocado topping, combine yogurt, juice, and avocado in a small bowl, mashing with a fork until smooth. Stir in tomato.
Step 4: Heat a grill pan over medium-high heat. (Or cook outside) Coat pan with cooking spray. Add shrimp to pan and grill 2 minutes on each side.
Step 5: Top each tostada with 1/4 cup bean mixture, 3 shrimp, and 1 tablespoon avocado mixture. Serve with lime wedges.