Press the wonton skins into the bottom and up the sides of 24 mini muffin cups.
Spoon 1 teaspoon of the sauce into the wonton cups. Press the pepperoni slices into the sauce and place a piece of cheese on top of the pepperoni. Sprinkle with the oregano and parmesan cheese.
Bake for 8 to 10 minutes, until the wonton skins are golden brown and the cheese melts.
Top with fresh basil leaves before serving if desired.