1. Preheat oven to 350°F. Cut each tortilla into 8 wedges and arrange wedges in a single layer on a baking sheet. Coat wedges with cooking spray and sprinkle with 1/4 teaspoon paprika. Bake 15 minutes or until lightly browned and crisp. Let cool.

2. In a large nonstick skillet, cook beef over medium-high heat until browned, stirring to crumble. Stir in chili powder, remaining paprika, cumin, garlic powder and salt, mixing well. Add 1/2 cup water. Reduce heat, and simmer 5 minutes, stirring occasionally or until water has evaporated.

3. On each of 4 individual serving plates, arrange lettuce. Top evenly with ground beef, tomatoes, onion and tortilla wedges. Top with salsa, Greek yogurt, and avocado, if desired.