1poundsirloin steaksliced thin (see note in post about using ground beef)
1green bell pepperdiced
1small yellow oniondiced
10 to 12hard shell tacossee note
Preheat the oven to 350 degrees. Grease a 9 by 13 baking dish and set aside.
Heat 2 tablespoons of olive oil over medium heat in a large skillet. Add the green bell pepper, onion, and mushrooms and cook until tender, about 5 to 7 minutes. Remove from the skillet and set aside.
Add the meat, season with salt and pepper, and cook the sliced sirloin for about 5 minutes or until it is browned.
Drain any excess fat, return the vegetables and their drippings to the pan and stir in the cream cheese. Stir just until it is melted and fully combined with the rest of the vegetables. Taste and season with salt and pepper if desired.
Fill the taco shells and place them in the prepared baking dish. Top with provalone cheese and bake for 10 to 15 minutes or until the cheese is melted and bubbly.
I used flat bottom taco shells and was only able to fit 10 taco shells in the casserole dish. If you were to use ones that weren't flat bottomed you would be able to fit 12.