Slice bell peppers in half from top to bottom and remove seeds and white ribs. Place peppers cut side up in a casserole dish with about 1/4 inch of water on the bottom. Cover the dish with foil and place in the heating oven.
In a skillet add 1 tablespoon of olive oil and once heated add diced onions cooking until translucent, approximately 5 minutes.
Add steak to the skillet and continue to cook until steak is cooked through, approximately 5 minutes. Salt and pepper to taste
Remove the peppers from the oven. Sprinkle a little salt in each pepper and stuff each with the steak and onion mixture.
Place one slice of provolone cheese over each pepper and place back in the oven , uncovered, for 20 minutes or until the peppers have softened.