Dice the onion, pepper, and zucchini, and slice the mushrooms. Heat a large, deep skillet over medium heat. Brown the meat and drain off any grease, reserving 1 tbsp in the skillet. Transfer the meat to a plate.
Step 2
Add the onion, pepper, mushrooms, and zucchini and saute for 3-4 minutes. Add the salt, pepper, marinara sauce, and cooked meat. Top with the grated cheese and pepperoni slices, then bring to a boil.
Step 3
Broil for 2-3 minutes in your oven until the cheese is bubbly. Serve immediately with your favorite sides.