Preheat oven to 375 degrees.
Combine ground turkey, garlic, onion, red pepper, mustard, thyme, salt and pepper in a large bowl. Meanwhile, cook quinoa according to package directions on the stove, or in a rice cooker.
Heat olive oil in frying pan on high, and cook meat mixture, breaking up with spoon. Saute for about 7-8 minutes until meat is fully cooked. Add cooked quinoa, remove from heat and set aside.
In a large pot of boiling water and using tongs, insert each individual cabbage leaf and submerge in water for a couple of seconds before quickly removing.
Add about 1-2 tbsp of meat mixture inside flattened out, softened cabbage leaf and roll up, placing in a large oven safe casserole dish. Repeat this until you fit about 18 cabbage rolls inside.
Pour marinara sauce over cabbage rolls, then cook for 15 minutes in the oven. Serve and enjoy!