Ingredients
1 medium yellow onion (peeled, quartered, thinly sliced)
1 teaspoon water
2 tablespoon no-sodium Italian seasoning
1 package sliced white mushrooms (roughly chopped)
1 pound beef filet top sirloin, cut into 1/2-inch strips
1 tablespoon balsamic vinegar
2 red or green bell peppers
1 1/2 teaspoons canola oil
1 teaspoon garlic powder
1/4 teaspoon salt
1/4 teaspoon freshly ground pepper
1 cup shredded, fat-free mozzarella cheese
4 small whole-wheat rolls, to serve
Directions
1
Tip: Click on step to mark as complete.
2
Preheat the oven to 450 degrees. Make 4 sheets of aluminum foil about 30 inches long. Fold the foil in half width wise (into almost a square) so it's extra-sturdy.
3
Peel and quarter the onion. Thinly slice each quarter and add to a heatproof container with water. Microwave onions until mostly tender, about 90 seconds to 2 minutes, depending on microwave's power. Carefully transfer onions into a medium bowl.
4
Seed each bell pepper and then thinly slice. Roughly chop the sliced mushrooms. Transfer both bell peppers and mushrooms into the bowl with the onion.
5
Thinly slice the top sirloin into 1/2-inch strips. Add sirloin into the bowl with the vegetables. Stir in balsamic vinegar, canola oil, Italian seasoning, garlic powder, salt, and pepper. Use tongs or a spoon to mix until combined.
6
Divide mixture into 4 equal portions into the center of each foil square. Top each portion with 1/4 cup cheese.
7
Securely seal the top and sides of each foil packet. Place each foil packet onto a large baking sheet and add into the preheated oven. Cook until beef is cooked through, about 20 minutes. (Remove 1 packet to check that steak is fully cooked before removing them all from the oven.)
8
Place each foil packet onto a plate. Carefully open each packet and serve with rolls.
9
Quick Tips
10
Cooking Tip: Low-fat varieties of cheeses like provolone or Swiss can be substituted for the mozzarella.
Notes
Tip: Onions require a longer cooking time than the other ingredients which is why they get a needed zap in the microwave before being add to the foil packet.