Slice the bell peppers in half and remove the membranes. In a medium sized skillet on medium heat add the butter, oil, minced garlic, and salt and pepper. Slice the roast beef into thin strips and and add them to the onion mixture. Line the bottom of each pepper with a slice of provolone cheese. Jan 13, Philly cheesesteak stuffed peppers are full of flavor and easy to make. The peppers are filled with steak, caramelized onions, mushrooms, and. Here's what you need: flank steak, olive oil, paprika, garlic powder, pepper, salt, large white onion, green bell pepper, red bell pepper, provolone cheese, fresh . Philly Cheesesteak Stuffed Bell Peppers Recipe Directions. Slice peppers in half lengthwise, remove ribs and seeds. Slice onions and mushrooms. Preheat oven to *. Slice roast beef into thin strips and add to the onion/mushroom mixture. Line the inside of each pepper with a slice of provolone cheese. Aug 2, Easy Philly Cheesesteak Stuffed Peppers are a delicious, quick way to enjoy great philly cheesesteak flavor in a stuffed bell pepper. Oct 16, Oops I did it again. Apparently the philly cheesesteak obsession is here to stay In that case, let's check out the latest low carb stuffed pepper.