Chop onion, peppers and mushrooms
Sautee onion, peppers, and mushrooms in olive oil, set aside when done
While vegetables are cooking, slice beef VERY thinly-use a sharp knife and take your time!
Layer 2 wonton wrappers into muffin tray to cover the inside
Sautee thinly sliced beef in same pan you cooked the vegetables, just until pink is gone
Add in the laughing cow cheese to the beef in the pan
Assemble wonton cups by layering beef/cheese mixture and vegetable mixture, fill halfway, layer in one more wonton wrapper, and finish filling with beef and vegetable
Top with mozzarella
Bake at 375 for 10-15 minutes