Preheat oven to 400°F and line a large baking sheet with parchment paper.
Slice the bell peppers and zucchini into thin rounds, then toss them with olive oil and a pinch of salt on the baking sheet.
Roast the vegetables for 10 minutes, then remove them from the oven and set aside.
In a mixing bowl, combine the ground chicken, egg, parmesan cheese, oregano, garlic powder, salt, and pepper.
Press the chicken mixture onto the parchment paper, forming a thin, even 8-inch circle.
Bake the chicken crust for 15 minutes until it is cooked through and the edges are golden brown.
Spread the tomato sauce over the crust and top with the roasted vegetables and mozzarella cheese.
Bake for an additional 5-7 minutes until the cheese is melted and bubbly.