Begin by preheating your oven to 425F. Using a oil coated muffin tin; press tortillas into each muffin cup, pleating sides as needed. Spritz tortillas with additional cooking spray and bake for 7 minutes, until lightly browned.
In a bowl add; shredded chicken, lime juice, coriander, oil, salt and pepper to taste. Cover and set aside.
Using a spoon gently place the chicken mixture in each tostada cup, topping with shredded cheese. Place back in the oven for 5 minutes or until cheese is melted.
While the Chicken Tostada Cups are in the oven, begin making the Salsa Cruda by combining; chopped plum tomatoes, onion, Jalapeño, cilantro, salt and pepper to taste.
Once Tostadas are done baking, top with diced avocado, salsa cruda, and sour cream. Serve and enjoy!