Dice and saute veggies over medium heat for 4-5 minutes. Season lightly with salt, pepper, and red pepper flakes. Add garlic and tomato paste and sauté for another minute.
Prepare soup as directed. If you do not plan on eating any of it on the day you prepare it, do not add the frozen peas. Let soup cool completely. Place in freezer safe bags or containers. Store for up to 3 months.