philly cheesesteak casserole- low carb

INGREDIENTS

• 2 lbs chip steak or 2 lbs cube steaks, cut into strips
• 1 green pepper, cut into strips
• 1 red pepper, cut into strips
• 1 onion, thinly sliced
• 1/2 lb mushroom, sliced more to taste
• 1 tablespoon olive oil
• 3/4 teaspoon kosher salt
• 3/4-1 teaspoon fresh ground pepper
• 1/4 lb pepperoni, thinly sliced
• 8 ounces provolone cheese, thinly sliced