Place the ground turkey in a large mixing bowl.
Add the minced green and red bell peppers, crushed garlic, sweet paprika, kosher salt, black pepper, dried thyme, oregano, marjoram, dried fennel, and sugar to the bowl.
Mix the ingredients thoroughly using your hands or a fork until evenly combined.
Form the mixture into patties or leave it crumbled, depending on how you plan to use it.
Cook patties or crumbled sausage in a skillet over medium heat until no longer pink in the center and an internal temperature reaches 165°F (74°C), about 8–10 minutes, stirring or flipping as needed.