Preheat the oven to 350°F.
Arrange the wonton wrappers in a 12-cup muffin pan then spray them lightly with cooking spray.
Bake the wonton cups for 5 minutes then remove them from the oven and set them aside.
Add the vegetable oil to a medium sauté pan set over medium-low heat. Add the ground meat and cook it, breaking it apart with a spatula, until it is browned and cooked through. Add the taco seasoning and stir to combine then remove the pan from the heat.
Assemble the taco cups by diving the ground meat evenly among the wonton cups. Top the ground beef with the shredded cheese, shredded lettuce, and a dollop of guacamole, salsa and sour cream then serve.