Preheat oven to 400 degrees.
Spray a 12 cup mini muffin pan with Pam,or a nonstick spray. Place wonton wrapper into the muffin pan, and press it into the bottom and sides. Set aside.
Heat a skillet to medium heat,add oil and onion and cook until softened, 3 - 4 minutes. Raise heat to medium-high. Add beef, garlic,salt and pepper. Cook and crumble for 4 - 5 minutes, until beef is fully cooked.
Drain any excess liquid from the skillet. Evenly distribute beef mixture among the wontons in the muffin cups, about 1 T. each. Top each with 1 T. gravy.
Evenly distribute frozen veggies among the cups, about 2 T. each, followed by the potatoes, about 1 T. each. Bake in the oven until the tops are slightly crispy and brown, about 15 minutes.