Preheat the oven to 400 degrees F.
Toss the peppers, tomatoes and broccoli with olive oil, salt and pepperon a sheet pan. Spread them out into a single layer with the tomatoes cut side up.
To assemble the frittata, spoon the roasted veggies into the skillet. Then and add the spinach, cheese and egg white mixture. Cook the frittata on the stove for 2-3 minutes until the edges set.