Preheat oven to 400°F. Put 2 mini muffin pans into the hot oven for a few minutes until hot. While mini muffin pan is preheating, prepare the Philly cheesesteak mixture.
In a medium skillet over medium-high heat, brown the meat. Once brown, add the onion, peppers and Worcestershire, and cook for 1-2 minutes. Remove from heat and cool.
In a medium bowl, mix the biscuit mix, milk, cooled meat mixture and 1 ½ cups of cheese. Season with salt and pepper.
Pull the hot pan out of the oven and spray muffin cups with cooking spray. Use a small scoop to evenly scoop heaping scoopfuls of the biscuit mixture into all of the mini muffin cups. Top each scoop of mixture with a little sprinkle of cheese.
Bake for 15 minutes or until golden on top.