2 tbsp olive oil, divided
4 green peppers, cut in half and deseeded
1 (8oz) sirloin steak
1 1/2 cups sliced mushrooms
1/2 red pepper, sliced
1 small red onion, sliced
2 cups mozzarella cheese, grated
Salt and pepper to taste
Preheat oven to 400 F. Cut green peppers in half and de-seed them. Drizzle with 1 tbsp. olive oil, season generously with salt and pepper and bake in a 9×13 dish covered with tin foil for 10 minutes.
Add remaining 1 tbsp. of olive oil to a large frying pan and heat over high heat until oil is smoking. Add steak, season generously with salt & pepper, then sear for 1 minute per side. Remove from heat and slice very thinly across the grain.
In the same skillet, add mushrooms and cook until they start to release juices, about 2 minutes. Add onions and red pepper, saute for 2-3 minutes until tender and seasoning with salt and pepper.
Meanwhile, remove green peppers from oven. Divide steak and veggies among peppers then top with cheese. Bake for 15 minutes or until cheese is melted. Remove and serve!